M02069_17 [TE]
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps;
| 型号： | M02069_17 |
| 厂家： | 
TE CONNECTIVITY |
| 描述： | 3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps |
| 文件： | 总45页 (文件大小：653K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Features
Applications
• High speed operation; suitable for SFP/SFF applications from
155Mbps to 4.3 Gbps.
• Supports Common Anode VCSEL, Common Cathode VCSEL, or FP
LASER. May be used with or without a monitor photodiode.
• Programmable temperature compensation. Modulation output and
bias output can be controlled using the programmable module
controller M02088 or a few discrete resistors.
• EPON FTTH modules
• Gigabit Ethernet modules
• 1G/2G/4G Fibre Channel modules
• Digital Video
• Supports DDMI (SFF-8472) diagnostics.
• DC or AC coupled modulation drive.
• Peaking circuit to optimize VCSEL response.
• Low overshoot allows high extinction ratio with low jitter.
• Supports E-PON burst mode with no extra components
• Automatic Laser Power Control, with “Slow-Start”.
• 3.3V or 5V operation
The M02069 is a highly integrated, programmable VCSEL driver intended for SFP/SFF modules to 4.3 Gbps. Using
differential PECL data inputs, the M02069 supplies the bias and modulation current required to drive a VCSEL or
edge-emitting laser. The modulation output can be AC or DC-coupled to a FP laser diode or AC coupled to a com-
mon anode or common cathode VCSEL
Peaking adjustment is available to improve VCSEL fall time.
EPON burst mode operation is supported with no extra components.
Integrated safety circuitry detects faults and provides latched bias and modulation current shutdown.
Functional Block Diagram
SV
Internal Power
Bus
CC
and
IB
Internal
3.3V reg.
OUT_CC
OUT-
D
+
-
IN
Input
Buff er
Output
Buf fer
Laser
Driv er
OUT+
D
IN
GND
0
VCC3 -1.3V
IBOUT_CA
and
SGND
IPIN
Saf ety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
CC SEL
1
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Ordering Information
Part Number
Package
Operating Temperature
M02069-12 *
M02069-EVM
QFN24
Combination Electrical and Optical Evaluation board
* The letter “G” designator after the part number indicates that the device is RoHS-compliant.
Revision History
Revision
Level
Date
Description
E
D
Release
Release
May 2015
Updated logos and page layout. No content changes.
March 2005
Revision D Release. New data sheet format. Changes to Absolute Maximum Ratings, Operating
Temperature, AC and DC specifications. New section on video operation.
C
B
A
Preliminary
Advance
Advance
February 2004
Revision C Release, Preliminary.
November 2003 Revision B Release.
October 2003 Initial Release.
24
19
SVCC
IBOUT
/
1
18
VCC
CC
DIN+
OUT-
OUT+
DIN-
\
VCC3SEL
GND
0
GND, connect to
PCB ground
IBOUT
/
SGNDCA
DIS
IPIN
Typical Eye Diagram
6
13
FAIL
7
12
4 X 4 mm
Pin Configuration
2
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
1.0 Product Specification
1.1
Absolute Maximum Ratings
These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reli-
able operation at these extremes for any length of time is not implied.
Table 1-1.
Symbol
Absolute Maximum Ratings
Parameter
Rating
Units
V
V
Power supply voltage
-0.4 to +6.0
V
V
CC
3.3V power supply voltage
-0.4 to +4.0
CC3
T
Storage temperature
-65 to +150
°C
mA
mA
mA
mA
V
STG
I
I
I
I
Maximum bias output current for common anode laser
Maximum bias output current for common cathode laser
Maximum modulation current for common anode laser
Maximum modulation current for common cathode laser
Data inputs
75
30
70
30
BIASOUTCA (MAX)
BIASOUTCC (MAX)
MODCA (MAX)
MODCC (MAX)
D +/-
-0.4 to V
+ 0.4
CC3
IN
DIS
Disable input
-0.4 to V + 0.4
V
CC
BIAS
, MOD
Bias and modulation output current mirror compliance
voltage
-0.4 to V
+ 0.4
V
MON
MON
CC3
I
I
Photodiode anode voltage
Sink or Source current
Status flag
-0.4 to V
+ 0.4
V
mA
V
PIN
CC3
2.0
-0.4 to V + 0.4
PIN
FAIL
APC , MOD
CC
Set inputs
-0.4 to V
-0.4 to V
-0.4 to V
+ 0.4
+ 0.4
+ 0.4
V
SET
SET
CC3
CC3
CC3
TC
Temperature compensation slope
Output
V
SLOPE
OUT+, OUT-
V
3
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
1.2
Recommended Operating Conditions
Table 1-2.
Recommended Operating Conditions
Parameter
Rating
Units
V
3.3 ± 7.5%
or 5.0 + 10%,-5%
Power supply (V -GND)
CC
Operating ambient
-40 to + 95
°C
1.3
DC Characteristics
(VCC = +3.05V to +3.55V or 4.75V to 5.5V, TA = -40 °C to +95 °C, unless otherwise noted)
Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 °C, unless otherwise noted.
Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 °C, unless otherwise noted.
Table 1-3.
DC Characteristics
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
I
Supply current excluding IMOD PEAK high (no peaking adjust)
–
mA
CC
ADJ
and I
BIAS
(1)
Common anode operation
–
–
28
35
48
55
(1)
Common cathode operation
Additional current when PEAK is used.
ADJ
–
–
15
Additional current when operating from a 5V
(2)
supply
IBOUT
IBOUT
Bias current adjust range, V(I
common anode mode
) > 0.7V
) < 2.5V
1
0.5
–
50
15
mA
mA
µA
CA
BIASOUT
BIASOUT
Bias current adjust range, V(I
common cathode mode
CC
IB
Bias current with optical output DIS = high
disabled
–
150
OFF
V(IBOUT
)
=
=
V
for common anode
CA
CC3
operation.
V(IBOUT
)
0V for common cathode
CC
operation.
Ratio of
BIAS
I
current to CC low, common anode mode
–
45.7
13.5
–
–
A/A
V
BIAS
SEL
current
MON
CC high, common cathode mode
SEL
V
Monitor diode reverse bias
voltage
1.5
–
MD
4
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 1-3.
DC Characteristics
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
I
Monitor
diode
current Adjusted with R
10
–
1500
µA
MD
APCSET
adjustment range
Ratio of TxPwr
monitor photodiode current
current to
1
A/A
pF
MON
C
Maximum monitor photodiode
capacitance for APC loop
stability. Includes all associated
parasitic capacitances.
100
MD_MAX
TTL/CMOS input high voltage
(DIS)
2.0
–
–
5.5
0.8
V
V
V
V
TTL/CMOS input low voltage
(DIS)
–
CMOS input high voltage
2.4
1.2
(VCC3
)
SEL
CMOS input low voltage
(VCC3
)
SEL
Logic output high voltage (FAIL) With external 10kΩ pull-up to V
.
V
- 0.6
CC
–
–
–
V
V
CC
Logic output low voltage (FAIL) For 6.8k to 10k ohm resistor when pulled up to
5V
–
0.4
For 4.7k to 10k ohm resistor when pulled up to
3.3V
R
Differential input impedance
Data inputs
--
--
6800
–
Ω
IN
V
Self-biased
common-mode
V
- 1.3
CC3
--
V
SELF
input voltage
V
Common-mode
input Data inputs
V
-
–
V
-[V
]/4
V
INCM
CC3
CC3 IN(Diff)
compliance voltage
1.45
200
2.5
V
Differential input voltage
= 2 x (D +
- D + )
IN LOW
–
2400
2.9
mVpp
V
IN(DIFF)
IN HIGH
(3)
V
3.3V supply detection, lower
threshold
2.8
CC3THL
(3)
V
3.3V supply detection, upper
threshold
3.65
3.9
3.8
4.25
5.8
4.1
4.65
6.2
V
V
V
CC3THH
V
5V supply detection, lower
threshold
CC5THL
V
5V supply detection, upper
threshold
5.45
1.8
CC5THH
V
Reference voltage for MOD
1.3
1.35
1.0
1.4
V
V
V
REF1
SET
SET
V
Reference voltage for APC
APCSET
V
Bias_OK
threshold
lower
voltage
0.88
1.05
BL
5
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For further information and support please visit:
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 1-3.
DC Characteristics
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
V
Bias_OK
threshold
upper
voltage
1.45
1.6
1.7
V
BH
(4)
V
Lower voltage threshold for FAIL asserts if any of these signals fall below this
fault inputs IBOUT , OUT+, value.
300
400
mV
FAULTL
CA
C
, and MOD
APC
SET
(5)
VFAULTH
Upper voltage threshold for FAIL asserts if any of these signals fall above this
2.6
0.5
2.9
1.65
0
V
- 0.2
V
V
V
CC3
fault inputs IBOUT
value.
CC
V
Self bias voltage for IBOUT
and OUT+
During disable state
CA
2.0
SELFL
V
Self bias voltage for IBOUT
During disable state
1.25
SELFH
CC
Notes:
1. Excludes bias and modulation currents.
2. Bias and modulation currents add directly to power supply current in 5V applications. The additional supply current noted excludes these currents.
3. V “supply OK” circuitry monitors the internally regulated 3.3V supply when V = 5V (VCC3 =low). When V = 3.3V, V “supply OK” circuitry
CC3
CC
SEL
CC
CC3
monitors V (VCC3 =high).
CC
SEL
4. A low level at IBOUT does not trigger a fault condition during common cathode operation.
CA
5. A low level at IBOUT does not trigger a fault condition during common anode operation.
CC
1.4
AC Characteristics
(VCC = 3.05 V to 3.55V or 4.7V to 5.5V, TA = -40 °C to +95 °C, unless otherwise noted)
Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 °C, unless otherwise noted.
Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 °C, unless otherwise noted.
Table 1-4.
AC Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units.
I
Modulation current adjust range
Common Cathode Mode
1
–
15
mA
MOD
OUT+ and OUT- AC coupled into 50Ω load.
Common Anode Mode
3
45
(1)
OUT+ and OUT- DC coupled into 25Ω load.
(2)
I
Modulation current with output disabled DIS = high
–
–
–
150
–
µA
MOD(OFF)
Ratio of modulation current to MOD
current
CC = high, RLOAD = 50Ω
30
A/A
MON
SEL
CC = low
65
–
SEL
4
I
Programmable range for modulation Adjustable using TC
current temperature coefficient
0
10
ppm/°C
°C
MOD-TC
SLOPE
T
Temperature at which modulation current
TC compensation enables
20
TCSTART
6
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 1-4.
AC Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units.
(3)
tr
Modulation output rise time
20% to 80% into 25 Ω . For I
from 3 mA to 30
–
67
80
ps
MOD
mA. Measured using 11110000 pattern at 2.5Gbps.
tf
Modulation output fall time
–
67
1
80
2
ps
%
OS
Overshoot of modulation output current in into 25 Ω load
the “off” direction
--
OFF
RJ
DJ
Random jitter
–
0.8
10
–
ps
rms
Deterministic jitter
K28.5 pattern at 4.3 Gbps
(includes pulse width distortion)
23
ps
pp
Notes:
1. Minimum voltage at OUT+ > 0.7V.
2. The current through the laser in this state can be made negligible by adding a 1kΩ or less resistor in parallel with the laser.
3. The M02069 is designed to drive 25Ω loads. External resistance should be added in series or parallel to the Laser to create this load impedance. In common
cathode mode, 50Ω resistors internal to the M02069 are in parallel with the laser..
1.5
Safety Logic Timing
(VCC = 3.05 V to 3.55V or 4.7V to 5.5V, TA = -40 °C to +95 °C, unless otherwise noted)
Typical values for common anode are at VCC = 3.3 V, IBOUTCA = 20 mA, IMOD = 20 mA, TA = 25 °C, unless otherwise noted.
Typical values for common cathode are at VCC = 3.3 V, IBOUTCC = 5 mA, IMOD = 5 mA, TA = 25 °C, unless otherwise noted.
Table 1-5.
Symbol
t_off
Safety Logic Timing
Parameter
Conditions
Min.
Typ.
Max.
Units.
DIS assert time
Rising edge of DIS to fall of output signal below
10
μs
(1)
10% of nominal
t_on
t_init
DIS negate time
Falling edge of DIS to rise of output signal above
90% of nominal
1
5
ms
ms
(1)
(2)
Time to initialize
Includes reset of FAIL; from power on after
Supply_OK or from negation of DIS during reset of
FAIL condition
2
3
t_fault
Laser fault time - from fault condition to From occurrence of fault condition or when
100
μs
μs
assertion of FAIL
Supply_OK is beyond specified range
(3)
t_reset
DIS time to start reset
DIS or ENA pulse width required to initialize safety
circuitry or reset a latched fault
10
7
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 1-5.
Safety Logic Timing
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units.
t_on
DIS negate (turn-on) time during burst- Using integrated switch at SVCC (3.3V operation)
mode operation
300
500
ns
BM
(4)
t_off
DIS assert (turn-off) time during burst- Using integrated switch at SVCC (3.3V
200
500
ns
BM
(4)
mode operation
operation)
Notes:
1. With CAPC = 2.2nF
2. User-adjustable. Specifications reflect timing with no external RESET capacitor.
3. With < 1nF capacitor from RESET pin to ground.
4. Imod > 12mA
Figure 1-1.
Safety Logic Timing Characteristics
Slow Rise on Vcc=3.3V at Power-up (DIS Low)
Hot Plug (DIS Low)
3.3V
VCC3
and
VCC5
status
VCC3 and VCC5
“OK”
VCC
3.3V
VCC3
(low)
FAIL
DIS
FAIL state at power-up will
depend on pull-up voltage
(low)
FAIL
DIS
(low)
t_on < 1ms,
(300 us typ.)
(low)
t_on < 1ms,
(300 us typ.)
LASER
OUTPUT
LASER
OUTPUT
8
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Transmitter Enable (DIS transition Low)
Slow Rise on Vcc=5V at Power-up (DIS Low)
5V
VCC3
and
VCC3 and VCC5
“OK”
(high)
VCC5
status
VCC
3.3V
VCC3
(low)
(low)
FAIL
DIS
(low)
(low)
FAIL
DIS
t_on < 1ms,
(300 us typ.)
t_on < 1ms,
(300 us typ.)
LASER
OUTPUT
LASER
OUTPUT
9
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Transmitter Disable (DIS transition high)
Fault Recovery Behaviour
Fault
recovery at:
(high)
VCC3
and
VCC5
status
VCC3 and VCC5
“OK”
MODSET
.
Fault
Removed
C
APC,OUT+,
IBOUTCA or
IBOUT CC
FAIL remains high
until reset by DIS
going high
(low)
FAIL
DIS
FAIL
DIS
t_reset,
10 us,
min.
t_off < 10 us,
(1 us typ.)
t_on < 1ms
LASER
OUTPUT
LASER
OUTPUT
Response to Fault
Unsuccessful Fault Reset Attempt
Fault at:
Fault Occurs
MODSET
APC, OUTP,
.
Fault Remains
C
Fault at:
IBOUT CC or
IBOUTCA
APCSET
t_fault < 100 us,
(4 us typ.)
t_init < 5ms,
(3 ms typ.)
FAIL
FAIL
DIS
DIS
t_reset,
10 us,
min.
LASER
OUTPUT
LASER
OUTPUT
10
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 1-2. Relationship Between Data Inputs and Modulation Outputs
D
+
IN
100 mV -
1200 mV
DIN
-
200 mV -
2400 mV
V
IN(DIFF)
V
OUT-
V
OUT+
> 0.7V
GND
11
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
2.0 Functional Description
2.1
Pin Definitions
Table 2-1.
Pin Definitions
Pin Number
Pin Name
VCC
Pin equivalent load
Function
Power supply, 5V or 3.3V.
1
Positive data input. Self biased. Compatible with AC coupled PECL, AC coupled CML,
and DC-coupled PECL (when V = 3.3V).
V
CC
CC3
V
CC
When D + is high, OUT+ will sink current.
IN
V
-1.3V
CC3
4 kΩ
D
+, D -
IN IN
2
DIN+
Negative data input. Self biased Compatible with AC coupled PECL, AC coupled CML,
3
DIN-
See DIN+ drawing
and DC-coupled PECL (when V = 3.3V).
CC
12
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
3.3V V Select.
CC
V
V
CC
CC3
Connect to V for V = 3.3V operation.
CC
CC
Connect to GND for V = 5V operation.
CC
VCC3SEL
4
VCC3SEL
190 Ω
72 kΩ
Bias and modulation output disable (TTL/CMOS).
V
CC
When high or left floating, the bias and modulation outputs are disabled. Set low for
normal operation.
V
CC3
7 kΩ
DIS
5
DIS
80 kΩ
13
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Safety circuit fault output (TTL/CMOS). Goes high when a safety logic fault is detected.
This output will also be high when DIS is high.
V
CC
Requires an external pull-up.
FAIL
6
FAIL
Safety circuit reset. Leave open for normal operation or add a capacitor to ground to
extend the reset time.
V
V
CC3
CC
Connect to GND to disable window comparators at APC
SET
RESET
7
RESET
190 Ω
14
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Disable delay control. Connect to ground for normal operation.
V
CC
In burst mode operation add a capacitor from this pin to ground to set the maximum
disable time. Disable times greater than this maximum will engage the “slow-start”
circuitry.
DISDLY
8
DISDLY
190 Ω
Modulation Current Monitor. Connect to the corresponding pin on the M02088 or
through a resistor to GND.
V
CC
V
CC3
The current through this pin is typically 1/50th of the MODULATION current to the laser
when CC is low or 1/25th the MODULATION current when CC is high.
SEL
SEL
This pin may be left open if the feature is not needed and the M02069 current
consumption will be reduced by 0.5mA typically.
MODMON
9
MODMON
190 Ω
Bias Current Monitor. Connect to the corresponding pin on the M02088 or through a
resistor to GND.
The current through this pin is typically:
1/45.7th of the BIAS current to the laser when CC is low
10
BIASMON
See MODMON drawing
SEL
1/13.5th of the BIAS current to the laser when CC is high
SEL
This pin may be left open if the feature is not needed and the M02069 current
consumption will be reduced by 0.5 mA typically.
15
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Transmit Power Monitor. Connect to the corresponding pin on the M02088 or through a
resistor to GND.
V
CC
V
CC3
The current through this pin is approximately the same as the photodiode current into
I
. The current out of this pin is low pass filtered (no external filtering required).
PIN
This pin may be left open if the feature is not needed and the M02069 current
consumption will be reduced by the I current.
PIN
TxPwr
MON
11
TxPwrMON
33 Ω
Average Power Control, laser bias current adjustment. Connect to the corresponding
pin on the M02088 or to a resistor between this pin and ground to set the bias current to
the laser.
V
CC
V
CC3
The APC loop will adjust the laser bias current to maintain a voltage at APC
of
SET
approximately 1.3V. The current sourced from this pin is approximately the same as the
current into I
.
PIN
APC
12
APCSET
SET
For CC low - Current input from monitor photodiode anode.
SEL
V
CC
V
CC3
The APC loop will adjust the laser bias current to maintain a voltage at APC
of
of
SET
SET
approximately 1.3V and at this pin of approximately one V
.
GS
For CC high - Current source for monitor photodiode cathode.
SEL
IPIN
The APC loop will adjust the laser bias current to maintain a voltage at APC
approximately 1.3V and at this pin of approximately one V below V
.
GS
CC3
13
IPIN
33 Ω
16
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Laser bias current output for common anode lasers (CC must be low).
SEL
V
CC
Connect directly to laser cathode or at higher bit rates through a ferrite or a resistor to
isolate the capacitance of this pin from the modulation drive, (~ 6pF).
Maintain a voltage at least 0.7V above GND at this pin
IBOUT
CA
IBOUTCA
(CCSEL = low)
14
Switched ground connection for common cathode lasers (CC must be high).
SEL
V
CC
Provides redundant shutdown during a disable or fault condition. This switch is disabled
during common anode operation.
SGND (CCSEL
= high)
SGND
Ground for output stage. May be connected directly to circuit board ground. At high bit
rates (>2Gb/s) an optional inductor or ferrite may be added to reduce switching
transients.
V
CC
GND
0
15
GNDO
17
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Positive modulation current output (AC or DC coupled to cathode of laser in common
V
anode designs). Sinks current when D + is HIGH.
CC
IN
Maintain a voltage > 0.7V at this pin.
OUT+
16
OUT+
GND
0
Negative modulation current output (AC coupled to anode of laser in common cathode
designs). Sinks current when D - is HIGH
17
OUT-
See OUT+ drawing
IN
Maintain a voltage > 0.7V at this pin.
Switched VCC. Supplies laser current for common anode designs. (CC
LOW).
must be
SEL
V
CC
V
CC3
Provides redundant shutdown during a disable or fault condition. This switch is disabled
during common cathode operation.
SVCC (CCSEL
low)
=
SV
CC
18
Laser bias current output for common cathode laser designs (CC must be high).
SEL
V
CC
V
CC3
Connect directly to laser anode or at higher bit rates through a ferrite or a resistor to
isolate the capacitance of this pin from the modulation drive.
Maintain a voltage of < 2.5V at this pin.
IBOUT
CC
IBOUTCC
(CCSEL = high)
12 kΩ
18
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Laser select input.
V
V
CC3
CC
When high, common cathode operation is selected; IBOUT and SGND are functional
CC
and internal 50Ω output terminations are switched in at the modulation outputs OUT+
and OUT-.
When low or floating, common anode operation is selected; IBOUT and SV are
CA
CC
functional and the 50Ω internal termination resistors at OUT+ and OUT- are
disconnected.
CCSEL
19
20
21
CCSEL
24 kΩ
48 kΩ
Automatic power control loop dominant pole capacitor. (Connect a capacitor between
V
CC
this pin and V .)
CC3
A nominal capacitance of 2.2nF will give a bias current enable time of less than 1 ms.
CAPC
CAPC
100 Ω
3.3V applications - Power supply input. Connect to V
.
CC
V
V
5V applications - Do not connect to 5V. Internally generated 3.3V power supply output.
Do not attach to non-M02069 circuitry.
CC
CC
VCC3
VCC3
19
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 2-1.
Pin Definitions
Pin Number
Pin Name
Pin equivalent load
Function
Peaking adjustment input. A resistor (2kΩ to 20kΩ) between this pin and ground sets
the amount of peaking current on OUT- to improve the fall time of the laser output. The
peaking current is approximately (5 * (1.3V / 2 kΩ + resistance to ground)).
V
V
CC
CC3
Connect to V
to disable peaking control.
CC3
+
-
1.28V
PEAK
22
PEAKADJ
ADJ
1.8 kΩ
Modulation current control. Connect a resistor to ground to set the modulation current.
V
V
CC
CC3
+
-
1.28V
MOD
SET
23
MODSET
190 Ω
Modulation current temperature compensation slope adjustment. Connect a resistor to
ground to set the temperature coefficient. Leave open to minimize the temperature
compensation coefficient.
24
TCSLOPE
GND
See MODSET drawing
Ground. Must be connected to ground for proper operation. This is the only package
ground connection.
CENTER
PAD
20
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 2-1. Pin Assignments for M02069 Device
24
19
SVCC/
IBOUT
1
18
VCC
CC
DIN+
OUT-
OUT+
DIN-
\
VCC3SEL
GND
GND, connect to
PCB ground
0
IBOUT /
SGNDCA
DIS
IPIN
6
13
FAIL
7
12
4 X 4 mm
21
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.0 Functional Description
3.1
Overview
The M02069 is a highly integrated laser driver intended for applications to 4.3 Gbps.
Many features are user-adjustable, including common anode or common cathode laser mode, the APC (automatic
power control) loop bias control (via a monitor photodiode), modulation current, temperature compensation control
of modulation current, and peaking adjustment. The part may be operated from a 3.3V or 5V supply.
For E-PON and other burst-mode applications, the part supports fast and accurate turn-on and turn-off of the laser
bias and modulation currents.
Safety circuitry is also included to provide a latched shut-down of laser bias and modulation current if a fault condi-
tion occurs. An internal VCC switch provides redundant shutdown when operating the device in common anode
configuration. An internal ground switch provides redundant shutdown when operating the device in common cath-
ode configuration.
Modulation, bias, and transmit power monitor current mirrors are provided for DDMI applications and allow monitor-
ing without disturbing the analog signal path.
22
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 3-1. M02069 Block Diagram Example
SV
Internal Power
CC
and
IB
Bus
Internal
3.3V reg.
OUT_CC
OUT-
D
+
-
IN
Input
Buffer
Output
Buffer
Laser
Driv er
OUT+
D
IN
GND
0
VCC3 -1.3V
IBOUT_CA
and
SGND
IPIN
Saf ety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
CC SEL
23
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.2
Features
•
•
High speed operation; suitable for SFP/SFF applications from 155Mbps to 4.3 Gbps.
Supports Common Anode VCSEL, Common Cathode VCSEL, or FP LASER. May be used with or without a
monitor photodiode.
•
Programmable temperature compensation. Modulation output and bias output can be controlled using the pro-
grammable module controller M02088 or a few discrete resistors.
Supports DDMI (SFF-8472) diagnostics.
DC or AC coupled modulation drive.
Peaking circuit to optimize VCSEL response.
Low overshoot allows high extinction ratio with low jitter.
Supports E-PON burst mode with no extra components
Automatic Laser Power Control, with “Slow-Start”.
•
•
•
•
•
•
•
3.3V or 5V operation
3.3
General Description
3.3.1
Detailed Description
The M02069 laser driver consists of the following circuitry: an internal regulator, common anode/common cathode
configuration control, bias current generator and automatic power control, data inputs, peaking adjust, modulation
current control, modulator output, laser fail indication, disable control, and monitor outputs for the bias current,
modulation current, and transmitted power.
3.3.2
Internal Regulator
The M02069 contains an internal 3.3V regulator so high bit rate performance can be achieved with 5V or 3.3V
power supply.
When operating from a 5V supply (V is connected to +5V), an internal regulator provides a voltage of approxi-
CC
mately 3.3V to the majority of the on-chip circuitry. The on-chip regulator is internally compensated, requiring no
external components. When a 3.3V supply is used (V and V
connected to 3.3V) the regulator is switched off
CC
CC3
and the internal circuitry is powered directly through the V
supply pin. The decision as to whether or not the
CC3
internal regulator is required is made via the VCC3
needs to monitor for proper +5V supply voltage.
pin, which also determines whether the safety circuitry
SEL
SV is sourced from V
through a switch for common anode applications (this pin becomes IB
in com-
CC
CC3
OUT_CC
mon cathode applications). When a fault condition is present, FAIL will assert and the switch sourcing SV will
CC
open so no current can pass through the laser. SV does not need any external capacitance, if capacitance to
CC
ground is added at SV it should be less than or equal to 100pF.
CC
V
and V
status are internally monitored by the M02069 during power-up and normal operation. During
CC3
CC
power-up the “slow-start” circuitry requires that V and V
each reach an acceptable level before enabling bias
CC3
CC
or modulation current.
24
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 3-1.
Pin Connection for 3.3V and 5V V
CC
Pin Connection For:
VCC = 3.3V
VCC = 5V
Connect to V
Reference for C
and PEAK
ADJ
CC
APC
VCC3
(pin 21)
Capacitor between C
and V
or V
Capacitor between C
and V
(not V )
CC3 CC
APC
CC3
CC
APC
CAPC
(pin 20)
Connect to V
Connect to V
or V to disable
Connect to V
to disable (not V )
CC3
CC
CC3 CC
PEAKADJ
(pin 22)
or V
Connect to GND
CC3
CC
VCC3
SEL
(pin 4)
3.3.3
Common Cathode/Common Anode Configuration Control
When CC
is programmed high, the M02069 is configured for common cathode lasers. When CC
is low, the
SEL
SEL
M02069 is configured for common anode lasers.
The state of the CC pin determines:
SEL
1. whether bias current is sourced or sunk
2. whether monitor photodiode current is sunk or sourced
3. whether internal termination resistors at OUT+ and OUT- are active
4. whether the redundant safety switch disconnects VCC or GND from the output circuitry.
The affected pins are OUT+, OUT-, SV /IB
, and SGND/IB
. The Table 3-2 below shows the configura-
CC
OUTCC
OUTCA
tion of each pin for the 2 states of CC
SEL.
25
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 3-2.
Pin Connection for Common Anode and Common Cathode Laser Modes
Pin Connection When:
CCSEL = High
CCSEL = Low
Inactive
Laser bias source current.
Ground for laser and all output load components Inactive
Supply for laser and all output load components.
SVCC
IBOUTCC
SGND
IBOUTCA
IPIN
Pin 18
Pin 14
Inactive
Inactive
Laser bias sink current.
Monitor photodiode source current
Controls Negative going edge of OUT-
Monitor photodiode sink current
Pin 13
Pin 22
Controls Negative going edge of OUT-, (do not
use)
PEAKADJ
Active
13.5:1
30:1
Inactive
45.7:1
65:1
Internal 50Ω pull-up resistors on OUT+
and OUT-
Ratio of Bias current to BIASMON
current
Ratio of Modulation current to
MODMON current
3.3.4
Bias Current Generator and Automatic Power Control
The M02069 can either source or sink bias current for the laser diode depending on whether it is in common anode
or common cathode mode. In common cathode mode (CC high) IB will source current. In common anode
SEL
OUTCC
mode (CC
low) IB
will sink current.
OUTCA
SEL
Regardless of whether the M02069 is configured for common anode or common cathode mode, the following infor-
mation applies.
To maintain constant average optical power, the M02069 incorporates a control loop to compensate for the
changes in laser threshold current over temperature and lifetime. The bias current will be determined by the value
of the external resistor R
and the transfer efficiency between the laser and monitor photodiode.
APCSET
The photo current from the monitor photodiode mounted in the laser package is sunk or sourced at I . This photo
PIN
current is mirrored and an equivalent current is sourced from pins TxPwr
and APC . The APC loop adjusts
SET
MON
the laser bias current (hence the monitor diode photo current) to maintain a voltage of 1.3V at APC
.
SET
R
* I
= 1.3 V
PIN
APCSET
The APC loop has a time constant determined by C
R
and the transfer efficiency between the laser and
APC, APCSET
monitor photodiode. The larger the C
capacitor the lower the bandwidth of the loop and the larger the R
APCSET
APC
resistor the lower the bandwidth of the loop.
26
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
In general, it is recommended that at least 2.2 nF of external capacitance be added externally between C
and
APC
V
to assure loop stability. With use of a 2.2 nF capacitor, the bias current can reach 90% of its final value within
CC3
1 millisecond.
In Common Anode mode with a 2.2nF C
capacitor the APC loop bandwidth is less than 30 kHz for almost all
APC
combinations of R
higher bit rates).
and transfer efficiency., which should be adequate for bit rates of 155Mbps. (and all
APCSET
In Common Cathode mode with a 2.2nF C
capacitor the APC loop bandwidth will be slightly higher, but should
APC
be less than 40 kHz for almost all combinations of R
and transfer efficiency. Contact the factory with your
APCSET
specific values of C
application.
, R
, and transfer efficiency to determine the maximum APC loop bandwidth in your
APCSET
APC
The bias generator also includes a bias current monitor mirror (BIAS
), whose output current is typically 1/
MON
45.7th of the bias current in common anode mode (CCSEL = low) or 1/13.5th of the bias current in common cath-
ode mode (CCSEL = high). This pin can be connected directly to an M02088 DDMI module controller or through a
resistor to ground. If this function is not needed this pin can be left open.
The M02069 can be used without a monitor photodiode by connecting BIAS
to APC
(see Figure 3-7 and
SET
MON
Figure 4-3). In this case the M02069 will increase the bias current (hence the BIAS
current) to the laser until
MON
the voltage at APC
is approximately 1.3V.
SET
3.3.5
Data Inputs
The inputs to the data buffers are self-biased through 4 kΩ resistors to an internal voltage VTT which is approxi-
mately V - 1.3V. Both CML and PECL inputs signals can be AC coupled to the M02069, or in 3.3V applications
CC3
PECL inputs can be DC coupled to the data inputs. In most applications the data inputs are AC coupled with con-
trolled impedance pcb traces which will need to be terminated externally with a 100Ω or 150Ω resistor between the
+ and - inputs.
3.3.6
Peak Adjust
Some VCSELs do not turn off quickly without peaking the negative going edge.
In common cathode applications, peaking on this edge can be added with a resistor connected between the PEAK-
input and GND. The amount of peaking is approximately
ADJ
Peaking current = 5 * (1.3V / 2 KΩ + resistance to ground).
The resistance to ground should be between 2 KΩ and 20 KΩ. (Which will result in a peaking currents from 2.6mA
to 260 μA.)
Peaking control can be disabled by connecting PEAK
ply current by approximately 2 mA.
to V
, resulting in no peaking current and reducing sup-
CC3
ADJ
In common anode configuration the PEAK
pin should be connected to V
.
CC3
ADJ
Note: Unlike the rest of the signal currents in the M02069, the output Peak Adjust current is unbalanced (single-
sided drive). The designer should be aware that the use of peaking may result in unwanted EMI emissions. If EMI
problems are traced to the use of peaking, high frequency decoupling (10pF capacitor or smaller) may be needed
on the V line.
CC
27
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.3.7
Modulation Control
There are two programmable control lines for controlling the modulation current and its temperature compensation.
These inputs can be programmed simply with a resistor to ground or they can be digitally controlled by the MACOM
module controller M02088.
The modulation current amplitude is controlled by the MOD
input pin. The modulation current is temperature
SET
compensated by the TC
input.
SLOPE
If the temperature compensation at TC
is disabled, the modulation output current is simply:
SLOPE
IOUT = 42 x (1.3V / R
) when CC
is low
MODSET
MODSET
SEL
and
IOUT = 22 x (1.3V / R
) when CC
is high and a 50Ω VCSEL is used.
SEL
Where R
is the resistance from pin MOD
to ground.
MODSET
SET
To temperature compensate the modulation current, choose R
to meet the following relationship:
TCSLOPE
-1.5
RTCSLOPE = 19.5*(TC) , where TC is the desired slope of the modulation current from 25°C to 85°C in%/°C and
RTCSLOPE is in kΩ. If no temperature compensation is desired, leave RTCSLOPE open.
In any case, RTCSLOPE will have negligible effect at M02069 case temperatures below 10°C.
For example:
Given a common cathode VCSEL with a desired modulation current at low temperatures of 10 mA and a tempera-
ture coefficient of -0.5%/°C at high temperatures (which will require a laser driver temperature coefficient of
+0.5%).
Choose RMODSET = 22 x (1.3V / 10mA) = 2.8kΩ.
-1.5
Choose RTCSLOPE =19.5*(0.5)
kΩ = 55kΩ.
28
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 3-2. Selecting TC
resistance in common anode configuration
SLOPE
RTCslope:
60.00
50.00
40.00
30.00
20.00
10.00
0.00
22k
27k
33k
39k
47k
51k
62k
75k
82k
100k
120k
150k
220k
390k
750k
open
-40
-20
0
20
40
60
80
100
-10.00
-20.00
-30.00
Ambient Temperature in degrees C
29
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 3-3. Selecting TC
Resistance in Common Cathode Configuration
SLOPE
RTCslope:
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
27k
33k
39k
47k
51k
62k
75k
82k
100k
120k
150k
180k
220k
390k
510k
-40
-20
0
20
40
60
80
100 open
-10.0
-20.0
-30.0
Ambient Temperature in degrees C
3.3.8
Modulator (Figure 3-4)
The output stages OUT+ and OUT- are designed to drive 25Ω output loads over a wide range of currents and cir-
cuit architectures. The VCSEL may be a common anode or common cathode device. The output can be AC, DC, or
Differentially coupled depending on the supply voltage and laser configuration.
In a common anode configuration with a VCSEL (Figure 4-1), OUT+ should be connected through a capacitor to
the VCSEL. A pull-up resistor should be added in parallel to the VCSEL from SVCC to the OUT+ output. The
dynamic impedance of the parallel combination of the VCSEL and pull-up resistor should be roughly 25 ohms. A 24
ohm pull-up resistor should also be added from SVCC to OUT- so the currents and voltage swings in the two out-
puts are balanced.
In a common anode configuration with a Fabry-Perot laser (Figure 4-4), OUT+ may be AC, DC, or Differentially
coupled to the laser cathode. A resistor should be added in series with the laser such that the dynamic impedance
of the series combination of the laser and resistor should be roughly 25 ohms. A 24 ohm pull-up resistor to SV is
CC
needed on the OUT- output.
For common cathode operation with a VCSEL (Figure 4-2), internal 50 ohm terminations are switched in between
the OUT+ and OUT- outputs and V
. VCSELs with impedances from 25-75Ω can be simply AC coupled to the
CC3
OUT- output with no additional load matching resistors. In this case OUT+ should be AC coupled to ground through
50Ω.
30
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
The VCSEL driver output stage is separately grounded from the rest of the circuitry (through GND ). At higher data
0
rates (above 2Gb/s) GND may be connected to ground through a minimum of 2 nH of inductance to improve the
0
transient response. A ferrite can also provide the extra isolation (Murata BLM18HG471SN1 or equivalent recom-
mended).
Figure 3-4. Modulator Output
*
0.75 nH
0.75 nH
OUT-
0.4pF
*
OUT+
OUT+ and OUT- should not be
driven below 0.7V
GND
0
(optional
external
inductance)
* Denotes bond
wire internal to
MLF package
3.3.9
Fail Output
The M02069 has a FAIL alarm output which is compatible with the TX_FAULT signalling requirements of common
pluggable module standards.
The ESD protection on this pin provides a true open collector output that can withstand significant variation in V
CC
when signalling between circuit boards. Also, if the M02069 loses power the FAIL output will continue to pull up and
signal a fail condition. In a simple static protection scheme used by other ICs the protection diodes would clamp the
FAIL signal to ground when the chip loses power.
3.3.10
TX Disable and Disable Delay Control
The DIS pin is used to disable the transmit signal. When the transmit is disabled both the bias and modulation cur-
rents are off.
The DIS input is compatible with TTL levels regardless of whether VCC = 5V or VCC = 3.3V. In most module appli-
cations a pull-up resistor to VCC between 4.7kΩ and 10kΩ is required. Because this pin has an internal 7kΩ resis-
tor to V , no external pull-up resistor is required.
CC
The DISDLY pin is used in conjunction with the DIS pin to control bias current enable time. (The modulation current
enable time is always less than 600 ns). Unless the DISDLY pin is programmed for burst mode, the APC loop
enable time will be slow (less than 1 ms with a C
= 2.2nF).
APC
When a capacitor C is added to the DISDLY pin, the slow-start circuitry is disabled for typically
6
T = 3 * 10 (sec/F)* C (F)
31
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
following the DIS high transition. If DIS transitions low during this time, the bias current will quickly return to within
90% of its final value (within less than 500ns). If DIS transitions low after this time the slow-start circuitry will
engage and the bias current will not return to its final value for approximately 1ms (depending on the C
capaci-
APC
tor).
3.3.11
Burst Mode Operation (Figure 3-5)
The M02069 will meet the timing requirements of EPON with the addition of a capacitor at DISDLY (see paragraph
above and Figure 3-5).
As shown in Figure 4-4, the laser should be DC coupled to OUT+. V may be 3.3V or 5V.
CC
32
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 3-5. DIS and DISLY Timing
EPON Burst Mode Operation
DIS
DISDLY
IBIAS OUT
OUT+
t_off BM< 500 ns
t_on BM< 500 ns for I MOD > 10 mA
Normal Operation, (slow-startwhenever part enabled)
DIS
DISDLY
t_on < 1 ms, depending on C APC
IBIAS
OUT
OUT+
t_off < 10μs
33
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.3.12
Video Operation
The M02069 can be used to transmit video optical data even in the presence of the pathological pattern. This is
done by fully DC coupling the signal from the input to the laser output.
In most data communications applications, AC coupling occurs at three points in a laser driver schematic: the data
inputs, the APC control, and coupling the modulation current to the laser. In the M02069, DC coupling can be used
at all three of these points. With DC coupling the laser output will not be a function of the data input one/zero den-
sity.
The data inputs can be DC coupled using PECL or CML levels.
The APC of the bias current is controlled by feedback from the monitor photodiode in the laser package in most
communications applications. In video applications this monitor photodiode should not be used if the pathological
pattern may occur. Instead, the APC should be controlled in an "open loop" configuration. (Open loop simply
means a monitor photodiode is not used). In the open loop configuration the APC is controlled by a resistor or a
thermistor network or a look-up table and DAC. This removes AC time constants from the bias current. In
Figure 3-6 the BIASmon pin is connected to the APCset pin. In this case the bias current is:
IBIAS = 45.7 x (1.35V / RAPC
)
SET
The modulation current output OUT+ can be DC coupled to the laser as shown in Figure 3-6. There are no AC
time constants in the modulation current amplitude in this configuration.
34
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 3-6. Video Application Block Diagram
VCC3
VCC
VCC3
Internal Power
Bus
SVCC
Internal
3.3V reg.
DIN
+
-
OUT-
OUT+
Input
Buffer
Output
Buffer
Laser
Driver
GND0
D
IN
VCC3 -1.3V
IBOUT_CA
IPIN
Safety
Circuitry with
LatchedFault
CCSEL
TX
Disable
Modulation
Control
AutomaticPowerControl
(laser bias current)
ForVCC=3.3V, tieVCC3 to VCC
.
Connect to VCC
when VCC = 3.3V
VCC3
Connect toGND
when VCC = 5V
35
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.3.13
Current Monitors
1
To facilitate complying with laser safety and DDMI requirements, output monitors are provided for transmit power
(TxPwr ), bias (BIAS ), and modulation current (MOD ).
MON
MON
MON
These outputs will source current proportional to the emitted optical power (TxPwr
) the bias current (BIAS
)
MON
MON
and modulation current (MOD
M02088 module controller.
). These outputs may be connected directly to the corresponding pins on the
MON
To use these pins without an M02088 they should be terminated with a resistor to ground that sets the desired full-
scale voltage (not to exceed 2.5V).
If the outputs of these monitors are not needed, TxPwr
, BIAS
, and MOD
can all be left floating and the
MON
MON
MON
chip current consumption will be reduced by the value of the monitor currents.
3.4
Laser Eye Safety
Using this laser driver in the manner described herein does not ensure that the resulting laser transmitter complies
with established standards such as IEC 825. Users must take the necessary precautions to ensure that eye safety
and other applicable standards are met. Note that determining and implementing the level of fault tolerance
required by the applications that this part is going into is the responsibility of the transmitter designer and manufac-
turer since the application of this device cannot be controlled by MACOM.
1
Digital Diagnostic Monitoring Interface for Optical Tranceivers, defined in SFF-8472.
36
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.4.1
Safety Circuitry
Safety Circuitry in the M02069 will disable the modulation and bias current and assert the FAIL output immediately
upon detecting a fault condition. In addition, the supply voltage that sources or sinks the laser current (SV or
CC
SGND) will immediately go open circuit and prevent any current from passing through the laser.
Fault conditions checked by the M02069 include shorts to ground or V of all pins which can increase the laser
CC
modulation or bias current.
For an initialization or power-up sequence to be successful, all the fault detection monitors must signal that the chip
is “healthy”.
When DIS goes low, pins are checked for shorts to ground or V and a FAIL condition is latched if there is a fault.
CC
If the state of the pins is OK, a one-shot at the reset pin begins a countdown which will latch a FAIL condition if the
bias current has not stabilized to an acceptable level during the one-shot time. The one-shot can be extended with
an external capacitor connected from the RESET pin to ground.
1
The one-shot width is approximately
T
= 3 ms + (0.3 ms/pF)x(external capacitance).
ONE-SHOT
Figure 3-7. Safety Circuit Block Diagram
DIS
If chip is ‘healthy’, then Enable
the outputs and Start 3msec
Reset Pulse(one-shot)
AND
AND
AND
OUTPUT_ENABLE
Latch for
CrudeFaults
VccOK Detection:
SRlatch:
Reset
AND
Q
5v Mode:
Vcc Pin
Set
5v Hi/Lo Limits
FAILout
(open-collector)
AND
Vcc3 Pin
Latch for
Bias_OK
3.3v Hi/Lo Limits
ONE-SHOT:
t=0
VCC_OK
Start
OR
SRlatch:
Reset
PULSE
3.3v Mode:
3ms + Tcap
Q
Vcc Pin
RESET
NOTE: Pulse stays high
if Reset pin is GNDed.
5v Hi/Lo Limits
Set
‘1’
AND
optional cap for longer T_init
Vcc3 Pin
3.3v Hi/Lo Limits
CrudeFaults Detection:
BiasOK Detection:
Window Compare:
OutP
Cmpc
> 300mV
> 300mV
HI Limit
CrudeFaults_OK
MODset > 300mV
IbiasOut > 300mV
MPCset
(2061)
OR
BIAS_OK
IboutCA > 300mV
(2069 – Common Anode)
LOW Limit
IboutCC < (Vcc3 – 300mV)
(2069 – Common Cathode)
1.The one-shot is actually comprised of an oscillator and 10-bit counter.
37
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
3.5
Fault Conditions
This section describes the M02069 operating modes during fault conditions. Over voltage, under voltage, pins
shorted to V and pins shorted to ground are included in the fault Table 3-3.
CC
Table 3-3.
Circuit Response to Single-Point Fault Conditions
Circuit Response to Over-voltage Condition or Short to Circuit Response to Under-Voltage Condition or Short to
Pin Name
VCC
Ground
V
Bias and modulation outputs are disabled once V rises above the Bias and modulation outputs are disabled once V drops below the
CC CC
CC
supply detection (high voltage) threshold (see Table 1-3)
supply detection (low voltage) threshold
DIN+, DIN-
The APC loop will attempt to compensate for the change in output The APC loop will attempt to compensate for the change in output
power. If the APC loop can not maintain the set average power, a power. If the APC loop can not maintain the set average power, a fault
(1,2,3)
(1,2,3)
fault state occurs.
state occurs.
VCC3
DIS
Does not affect laser power.
Does not affect laser power.
SEL
Bias and modulation outputs are disabled.
Does not affect laser power (normal condition for circuit operation).
SV is opened when CC is low or floating (or SGND is opened
CC
SEL
when CC is high)
SEL
FAIL
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
RESET
MOD
BIAS
MON
MON
TxPWR
MON
SET
(1)
(1)
APC
A fault state occurs.
A fault state occurs.
(1)
(1)
I
A fault state occurs.
A fault state occurs.
PIN
(3)
(4)
(1)
(1)
IBOUT
IBOUT
The laser will be turned off, then a fault state occurs.
A fault state occurs.
CA
(1)
(1)
A fault state occurs.
The laser will be turned off, then a fault state occurs.
CC
(3)
(1)
OUT+
Laser modulation is prevented; the APC loop will increase the bias A fault state occurs.
current to compensate for the drop in laser power if it is DC
coupled. If the set output power can not be obtained, a fault state
(1,2)
occurs.
(4)
OUT-
Does not affect laser power during common cathode operation Does not affect laser power during common cathode operation
because output is AC coupled.
because output is AC coupled.
(3)
(1)
SV
Does not affect laser power.
Laser bias current will be shut off and a fault state occurs.
CC
APC
CC3
(1)
(1)
C
Laser bias current will be shut off, then a fault state occurs.
A fault state occurs.
V
Bias and modulation outputs are disabled once V
the supply detection (high voltage) threshold
rises above Bias and modulation outputs are disabled once V
drops below the
CC3
CC3
supply detection (low voltage) threshold
PEAK
Does not affect laser power.
Does not affect laser power
ADJ
CC
Normal operation for common cathode configuration. If the M02069 Normal operation for common anode configuration. If the M02069 is
SEL
(1)
(1)
is configured for common anode drive, a fault state will occur.
configured for common cathode drive, a fault state will occur.
38
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Table 3-3.
Circuit Response to Single-Point Fault Conditions
Circuit Response to Over-voltage Condition or Short to Circuit Response to Under-Voltage Condition or Short to
Pin Name
VCC
Ground
(1)
MOD
When the laser is DC coupled in common anode configuration, the A fault state occurs.
APC loop will attempt to compensate for the drop in output power. If
SET
the APC loop can not maintain the set average power, a fault state
(1,2)
occurs.
TC
Does not affect laser power.
When the laser is DC coupled in common anode configuration, the
APC loop will attempt to compensate for any change in output power.
If the APC loop can not maintain the set average power, a fault state
SLOPE
(1,2)
occurs.
DISDLY
Notes:
Does not affect laser power.
Does not affect laser power.
1. A fault state will assert the FAIL output, disable bias and modulation outputs and will either open the switch at SV (CC =high) or S
(CC =low).
SEL
CC
SEL
GND
2. Does not affect laser power when the output is AC coupled to the laser.
3. Does not affect laser power during common cathode operation.
4. Does not affect laser power during common anode operation.
39
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
4.0 Applications
4.1
Applications
•
•
•
•
EPON FTTH modules
Gigabit Ethernet modules
1G/2G/4G Fibre Channel modules
Digital Video
Figure 4-1. Application Diagram, Common Anode VCSEL
(may be DC coupled, but extra bias current will be required for the pull-up resistor on OUT+)
VCC3
VCC
VCC3
VCC3
Internal Power
Bus
SVCC
Internal
3.3V reg.
OUT-
OUT+
GND0
DIN
+
Input
Buffer
Output
Buffer
Laser
Driver
DIN
-
VCC3 -1.3V
IB OUT_CA
IPIN
Safety
Circuitry with
LatchedFault
CCSEL
TX
Disable
Modulation
Control
AutomaticPowerControl
(laser bias current)
ForVCC=3.3V, tieVCC3 to VCC
.
Connect to VCC
when VCC= 3.3V
VCC3
Connect toGND
when VCC= 5V
40
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 4-2. Application Diagram, Common Cathode VCSEL
VCC
VCC3
Internal Power Bus
Internal
3.3V reg.
OUT+
OUT-
GND0
Input
Buffer
Output
Buffer
Laser
Driver
D
+
IN
DIN-
VCC3 -1.3V
IBOUT_CC
SGND
IPIN
VCC
Safety
Circuitry with
LatchedFault
CCSEL
TX
Disable
Modulation
Control
AutomaticPowerControl
(laser bias current)
ForVCC=3.3V, tieVCC3 to VCC
.
Connect to VCC
when VCC = 3.3V
VCC3
ConnecttoGND
when VCC = 5V
41
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 4-3. Application Diagram, Common Cathode VCSEL w/o Monitor Diode
VCC
VCC3
Internal Power
Bus
Internal
3.3V reg.
OUT+
OUT-
Output
Buf fer
Laser
Driver
Input
Buf fer
D
+
IN
GND
0
DIN-
VCC3 -1.3V
IB
OUT_CC
SGND
IPIN
VCC3
Saf ety
Circuitry with
LatchedFault
CCSEL
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
For V =3.3V, tie V
to V
.
CC
CC
CC3
Connect to VCC
when V CC =3.3V
VCC3
Connect toGND
when V CC =5V
42
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
Figure 4-4. Application Diagram, Common Anode FP Laser, DC Coupling
VCC3
VCC
VCC3
Internal Power
Bus
SVCC
Internal
3.3V reg.
DIN
+
-
OUT-
OUT+
Input
Buffer
Output
Buffer
Laser
Driver
GND0
D
IN
VCC3 -1.3V
IBOUT_CA
IPIN
Safety
Circuitry with
LatchedFault
CCSEL
TX
Disable
Modulation
Control
AutomaticPowerControl
(laser bias current)
ForVCC=3.3V, tieVCC3 to VCC
ForEPONoperation,adda
capacitortoGNDat DISDLY.
.
Connect to VCC
when VCC = 3.3V
VCC3
Connect toGND
when VCC = 5V
43
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
5.0 Packaging Specification
5.1
Package Specification
Figure 5-1. QFN24 Package Information
Note: View is for a 20 pin package. All dimensions in the
tables apply for the 24 pin package
44
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M02069-12
3.3 or 5 Volt VCSEL/FP Laser Driver IC for Applications to 4.3 Gbps
Rev V2
M/A-COM Technology Solutions Inc. All rights reserved.
Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM")
products. These materials are provided by MACOM as a service to its customers and may be used for
informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or
in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM assumes
no responsibility for errors or omissions in these materials. MACOM may make changes to specifications and
product descriptions at any time, without notice. MACOM makes no commitment to update the information and
shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its
specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any
intellectual property rights is granted by this document.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL
DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER
INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY OR
COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE
MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS,
WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM customers
using or selling MACOM products for use in such applications do so at their own risk and agree to fully indemnify
MACOM for any damages resulting from such improper use or sale.
45
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