M02061G-21 [TE]
3.3 or 5 Volt Laser Driver;
| 型号： | M02061G-21 |
| 厂家： | 
TE CONNECTIVITY |
| 描述： | 3.3 or 5 Volt Laser Driver 接口集成电路 |
| 文件： | 总45页 (文件大小：699K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Applications
Features
• SFP and SFF Modules
• 1G/2G/4G Fibre Channel modules
• High-speed operation; suitable for SFP/SFF applications.
Typical rise/fall times of 55 ps.
• Programmable temperature compensation. Modulation output and
bias output can be controlled using a few discrete resistors.
• Supports DDMI (SFF-8472) diagnostics
• DC or AC coupled modulation drive. Up to 100 mA modulation
current available when AC coupled.
• Short reach and Metro SONET/SDH
• CPRI: 614.4, 1228.8, 2457.6, 3072.0, 4915.2 and 6144.0 Mbit/s
• OLT Laser Driver for GPON and EPON
• Low overshoot allows high extinction ratio with low jitter
• Automatic laser power control, with “Slow-Start”
• PECL and CML compatible differential data inputs
• Complies with major MSAs (GBIC, SFF, SFF-8472, SFP) including
timing requirements
• Packaged in a QFN24
• 3.3 V or 5 V operation
• Pulse width adjustment
The M02061 is a highly integrated, programmable laser driver intended for SFP/SFF modules. Using differential
PECL data inputs, the M02061 supplies the bias and modulation current required to drive an edge-emitting laser.
The modulation output can be DC coupled to the laser diode.
The M02061 includes automatic power control to maintain a constant average laser output power over temperature
and life. In addition, the modulation current can be temperature compensated to minimize variation in extinction
ratio over temperature.
Typical Applications Diagram
V
CC
VCC
VCC3
VCC
Internal Power Bus
SV
CC
Internal
3.3V reg.
OUT-
D
+
IN
Laser
Driver
Input
Buffer
Output
Buffer
OUT+
D - FF
D
-
IN
GND
0
V
CC
VCC3 -1.3V
IBIAS
IPIN
OUT
Input
Buffer
Safety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
VCC3
VCC
(M02061-12
only)
(M02061-21
only)
1
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Ordering Information
Part Number
Package
Pin Configuration
M02061-12
M02061G-12*
M02061-21
QFN24
QFN24 (RoHS Compliant)
QFN24
DISDLY function on pin 8
DISDLY function on pin 8
SCB function on pin 8
SCB function on pin 8
DISDLY function on pin 8
M02061G-21*
M02061-EVM
QFN24 (RoHS Compliant)
Combination Optical and Electrical Evaluation board
*The G in the part number indicates that this is an RoHS compliant package.
Revision History
Revision
Level
Date
Description
V6
V5
Release
Release
May 2015
Updated logos and page layout. No content changes.
November 2014
Add Figure 4-2 . Recommended component values for AC coupling Laser. Change data sheet marking and
numbering to the MACOM system.
G (V4)
F (V3)
Release
Release
July 2012
Added recommendation for 100 k Ω pull-up resistor at pin 14 IBIASout when pin 18 SVCC is used to control
laser current.
February 2010
Added CPRI data rates to front page.
Added T specification and added equation for T specification in Table 1-1.
J
A
E (V2)
D (V1)
Release
Release
February 2006
Added information for the M02061-21 with pin SCB instead of pin DISDLY.
September 2005 New format. Remove 32 pin package information.
Changes to Absolute Maximum Specifications - operating temperature, output voltage.
Changes to Recommended Operating Conditions - VCC, operating temperature.
Changes to DC Characteristics - ICC, VMD, TxPWRmon, logic inputs and outputs, data inputs, safety logic
thresholds.
Changes to AC Characteristics - IMOD, Tr, Tf, jitter.
Added eye diagram, ; corrected rise/fall times.
C
Preliminary
March 2004
2
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
2.5Gbps Electrical Eye Diagram
QFN24 Pin Configuration
19
24
VCC
1
18
SVCC
OUT-
OUT+
DIN+
DIN-
VCC3SEL
DIS
GND0
GND, connect to
PCB ground
IBIASOUT
IPIN
6
13
FAIL
7
12
Conditions: 80mA modulation current, 2^7-1 PRBS
4mm x 4mm
3
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
1.0 Product Specification
1.1
Absolute Maximum Ratings
Table 1-1.
Absolute Maximum Ratings
Symbol
Parameter
Rating
Units
V
Power supply voltage
Junction temperature
-0.4 to +6.0
V
CC
1
T
°C
J
-40 to +110
-0.4 to +4.0
V
3.3V power supply voltage
Operating ambient temperature
Storage temperature
V
°C
°C
mA
mA
V
CC3
2
T
-40 to +95
A
T
-65 to +150
150
STG
BIASOUT (MAX)
I
Maximum bias output current
Maximum modulation current
Data inputs
I
140
MOD (MAX)
D +/-
0 to V
+ 0.4
CC3
IN
DIS, SCB, VCC3
Mode control inputs
-0.4 to V + 0.4
V
SEL
CC
BIAS
, MOD
Bias and modulation output current mirror compliance
voltage
-0.4 to V
+ 0.4
V
MON
MON
CC3
IPIN
Photodiode anode voltage
Photo diode current
-0.4 to V
+ 0.4
V
mA
V
CC3
IPIN
FAIL
2
Status flags
-0.4 to V + 0.4
CC
PWA, APC , MOD
Set inputs
-0.4 to V + 0.4
CC3
V
SET
SET
TC
TC
Temperature compensation start temperature
Temperature compensation slope
Output
-0.4 to 1.0
-0.4 to V + 0.4
V
START
SLOPE
V
CC3
OUT+, OUT-
1. QFN package:
-0.4 to V + 0.4
V
CC
Air Velocity
0 m/s
1 m/s
θ
JA
57 ºC/W
50 ºC/W
45 ºC/W
2.5 m/s
The above thermal resistance is based on a 4-layer JEDEC standard board (76.2 x 114.3 mm).
2. The maximum operating ambient temperature is the lesser of 95 °C or T ≤ T (Max) - (θ (Max) x Q) where Q is the power dissipated
A
J
JA
in the M02061.
4
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged.
Reliable operation at these extremes for any length of time is not implied.
1.2
Recommended Operating Conditions
Table 1-2.
Recommended Operating Conditions
Parameter
Rating
Units
Power supply (V -GND)
3.3 ± 7.5%
V
CC
or 5.0 + 8%, -5%
Operating ambient
-40 to + 95
°C
1.3
DC Characteristics
(V = +3.05V to +3.55V or 4.75V to 5.4V, T = -40 °C to +95 °C, unless otherwise noted)
CC
A
Typical values are at V = 3.3 V, I
= 30 mA, I
= 30 mA, T = 25 °C, unless otherwise noted.
CC
BIASOUT
MOD A
Table 1-3.
DC Characteristics (1 of 3)
Symbol
Parameter
Conditions
Minimum
Typical
Maximum
Units
I
Supply current excluding PWA high (no pulse width adjust)
–
35
61
mA
CC
IMOD and I
BIAS
additional current when PWA used
-
-
1.5
1.5
-
-
additional current when operating from a 5V
supply
I
Bias current adjust range
V(I
) > 0.7V
mA
µA
BIAS
BIASOUT
For 3.3V operation with an AC coupled laser
For 5.0V operation with a DC coupled laser.
1
1
100
60
I
Bias current with optical output DIS = high
disabled
–
–
300
BIAS(OFF)
V(I
) > V - 1V
CC
BIASOUT
Ratio of
BIAS
I
current to
–
100
–
–
A/A
V
BIAS
current
MON
V
Monitor diode reverse bias V =3.3V
voltage
1.5
10
–
MD
CC
I
Monitor
adjustment range
diode
current Adjusted with R
–
1500
1.25
µA
A/A
MD
APCSET
Ratio of TxPwr
current to
0.95
1
MON
monitor photodiode current
5
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 1-3.
DC Characteristics (2 of 3)
Symbol
Parameter
Conditions
Minimum
Typical
Maximum
Units
C
Maximum monitor photodiode
capacitance for APC loop
100
pF
MD_MAX
stability.
Includes
all
associated
capacitances.
parasitic
TTL/CMOS input high voltage
(DIS)
2.0
–
–
–
5.4
0.8
V
V
V
V
V
V
TTL/CMOS input low voltage
(DIS)
CMOS input high voltage
2.4
1.2
–
(VCC3 , SCB)
SEL
CMOS input low voltage
(VCC3 , SCB)
SEL
Logic output high voltage With external 10kΩ pull-up to V
(FAIL)
.
V
- 0.5
–
CC
CC
Logic output low voltage For 6.8k to 10k Ω resistor when pulled up to 5V.
(FAIL)
–
–
0.4
For 4.7k to 10k Ω resistor when pulled up to
3.3V.
R
Differential input impedance
Data inputs
–
–
6800
–
–
Ω
IN
V
Self-biased
common-mode
V
- 1.3
V
SELF
CC3
input voltage
V
Common-mode
input Data inputs
V
- 1.45
–
V
-[V
]/4
V
INCM
CC3
CC3 IN(Diff)
compliance voltage
V
Differential input voltage
= 2 x (D +
- D + )
IN LOW
200
2.5
–
2400
3.0
mVpp
V
IN(DIFF)
IN HIGH
(1)
V
3.3V supply detection, lower
threshold
2.8
CC3THL
(1)
V
3.3V supply detection, upper
threshold
3.65
3.9
3.9
4.25
4.65
6.1
V
V
V
V
CC3THH
V
5V supply detection, lower
threshold
4.25
5.8
CC5THL
V
5V supply detection, upper
threshold
5.4
CC5THH
V
Reference
MOD
voltage
for
1.18
1.3
1.4
REF1
SET
V
Reference voltage for APC
1.3
1.0
V
V
APCSET
SET
V
Bias_OK
threshold
lower
voltage
0.88
1.05
BL
6
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 1-3.
DC Characteristics (3 of 3)
Symbol
Parameter
Conditions
Minimum
Typical
Maximum
Units
V
Bias_OK
threshold
upper
voltage
1.45
1.6
1.7
V
BH
V
Lower voltage threshold for FAIL asserts if any of these signals fall below this
fault inputs I , OUT+, value.
300
400
2.2
mV
FAULTL
BIASOUT
C
, AND MOD
APC
SET
V
V
V
Self bias voltage for I DIS = high
BIASOUT
0.5
1.65
V
V
V
OUT_DIS
and OUT+
SHDWN
voltage
output
low DIS = low, I
≤ 100uA
≤ 10uA
V
- 4
SHDWNL
OUT
OUT
SHDWNOUT
SHDWNOUT
CC
SHDWN
voltage
output high DIS = low, I
V
- 0.3V
SHDWNH
CC
NOTES:
1. When V = 5V, V
“supply OK” circuitry monitors the internally regulated 3.3V supply. When V = 3.3V, V
“supply OK” circuitry monitors V .
CC
CC3
CC
CC3 CC
1.4
AC Characteristics
(V = 3.05 V to 3.55V or 4.75V to 5.4V, T = -40 °C to +95 °C, unless otherwise noted)
CC
A
Typical values are at V = 3.3 V, I
= 30 mA, I
= 30 mA, 25 ohm load and T = 25 °C, unless otherwise
CC
BIASOUT
MOD A
noted.
Table 1-4.
AC Characteristics (1 of 2)
Symbol
Parameter
Conditions
Minimum Typical Maximum
Units
I
Modulation current range
3.3V operation, AC coupled, OUT+ and OUT-
>1.6V
10
–
100
mA
MOD
(1)
5V operation, DC coupled into a 25Ω load to
10
80
VCC - 1.2V. OUT+ and OUT- >1.15V
I
Modulation current with output disabled DIS = high
–
–
–
300
–
µA
MOD(OFF)
Ratio of modulation current to MOD
current
100
A/A
MON
(2)
4
I
Programmable range for modulation Adjustable using TC
current temperature coefficient
0
–
10
ppm/°C
MOD-TC
SLOPE
7
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 1-4.
AC Characteristics (2 of 2)
Symbol
Parameter
Conditions
Minimum Typical Maximum
Units
tr
Modulation output rise time
20% to 80% into 25 Ω.
Measured using 11110000 pattern at 2.5Gbps
–
55
75
ps
(2)
tf
Modulation output fall time
–
55
1
75
–
ps
%
OS
Overshoot of modulation output current into 25 Ω load
in the off direction.
--
RJ
DJ
Random jitter
–
0.8
–
ps
rms
31
Deterministic jitter
Measured into 25Ω load, 2 - 1 PRBS at 2.7
ps
pp
Gbps
10
10
25
30
K28.5 pattern at 4.25 Gbps
3
(includes pulse width distortion )
NOTES:
1. Guaranteed by design and characterization.
2. DC coupled operation at 3.3V is not supported. AC coupled operation at 5V is possible provided the outputs never exceed 6V.
3. Pulse width distortion is measured single-ended.
1.5
Safety Logic Timing
(SCB pin low, V = 3.05 V to 3.55V or 4.7V to 5.4V, T = -40 °C to +95 °C, unless otherwise noted)
CC
A
Table 1-5.
Symbol
t_off
Safety Logic Timing (1 of 2)
Parameter
Conditions
Minimum Typical Maximum
Units
DIS assert time
DIS negate time
Time to initialize
Rising edge of DIS to fall of output signal below
10% of nominal
10
μs
(1)
t_on
t_init
Falling edge of DIS to rise of output signal above
90% of nominal
1
ms
ms
(1)
(2)
Includes reset of FAIL; from power on after
Supply_OK or from negation of DIS during reset of
FAIL condition
2
3
5
8
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 1-5.
Symbol
t_fault
Safety Logic Timing (2 of 2)
Parameter
Conditions
Minimum Typical Maximum
Units
Laser fault time - from fault condition to From occurrence of fault condition or when
100
μs
assertion of FAIL
Supply_OK is beyond specified range
(3)
t_reset
DIS time to start reset
DIS pulse width required to initialize safety circuitry
or reset a latched fault
10
μs
μs
ns
ns
t
Supply_OK delay time
Delay between Supply_OK condition and when
outputs are enabled
10
20
VCC_OK
t_on
t_off
DIS negate (turn-on) time during burst- I
mode operation
>
20mA; outputs DC coupled (5V
300
200
500
500
BM
BM
MOD
(4)
operation)
DIS assert (turn-off) time during burst- I
mode operation
> 20mA; outputs DC coupled (5V operation)
MOD
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.
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+
> 1.60Vwhen VCC5_OR high
> 1.15V when VCC5_OR low
GND
9
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 1-2. Safety Logic Timing Characteristics, SCB pin low
Slow Rise on Vcc = 5V at Power-up (DIS Low)
Hot Plug (DIS Low)
5V
VCC3
and
VCC5
status
VCC
V
“OK”
CC3 and VCC5
3.3V
VCC3
(low)
(low)
FAIL
DIS
(low)
(low)
FAIL
DIS
t_on < 1ms,
(300 μs typ.)
t_on < 1ms,
(300 μs typ.)
LASER
OUTPUT
LASER
OUTPUT
10
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Slow Rise on Vcc=3.3V at Power-up (DIS Low)
Transmitter Enable (DIS transition Low)
3.3V
VCC3
and
VCC5
V
“OK”
CC3 and VCC5
VCC
(high)
3.3V
status
VCC3
FAIL state at power-up will
depend on pull-up voltage
(low)
(low)
FAIL
DIS
(low)
FAIL
DIS
(low)
t_on < 1ms,
(300 μs typ.)
t_on < 1ms,
(300 μs typ.)
LASER
OUTPUT
LASER
OUTPUT
11
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Transmitter Disable (DIS transition high)
Fault Recovery Behavior
Fault
recovery at:
(high)
VCC3
and
VCC5
status
VCC3 and VCC5
“OK”
Fault
Removed
MODSET
.
CAPC, OUT+,
or IBout
FAIL remains high
until reset by DIS
going high
FAIL
DIS
(low)
FAIL
DIS
t_reset,
10 μs,
min.
t_off < 10 μs,
(1 μs typ.)
t_on < 1ms
LASER
OUTPUT
LASER
OUTPUT
Response to Fault
Unsuccessful Fault Reset Attempt
Fault Occurs
Fault at:
MODSET
APC, OUTP,
or IBout
.
Fault Remains
Fault at:
APCSET
C
t_fault < 100 μs,
(4 μs typ.)
t_init < 5ms,
(3ms typ.)
FAIL
FAIL
DIS
DIS
t_reset,
10 μs,
min.
LASER
OUTPUT
LASER
OUTPUT
12
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
2.0 Pin Definitions
Table 2-1 lists pin type definitions and descriptions for the M02061 device.
Table 2-1.
M02061 Pin Definitions and Descriptions (1 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
1
2
V
Power supply
Positive data input. Self biased. Compatible with AC coupled PECL, AC coupled
CC
D +
IN
V
CC3
V
CML, and DC-coupled PECL (V = 3.3V).
CC
CC
When D + is high, OUT+ sinks current.
IN
V
TT
4 kΩ
D
+, D -,
IN IN
or
CLK+, CLK-
3
D -
See D + drawing
Negative data input. Self biased Compatible with AC coupled PECL, AC coupled
IN
IN
CML, and DC-coupled PECL (V = 3.3V).
CC
13
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (2 of 9)
Pin Name Pin equivalent load
4x4 mm
QFN24 Pin
Number
Function
4
VCC3
3.3V V Select.
CC
SEL
V
V
CC
CC3
Connect to V
for V = 3.3V operation.
CC
CC3
Connect to GND for V = 5V operation.
CC
V
CC5_ OR
190 Ω
72 kΩ
5
DIS
Bias and modulation output disable (TTL/CMOS).
V
CC
V
CC3
7 kΩ
DIS
80 kΩ
14
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (3 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
6
FAIL
Safety circuit control failure output (TTL/CMOS). Goes high when a safety logic fault
is detected. This output will be low when DIS is high.
V
CC
FAIL
7
RESET
Safety circuit reset. Leave open for normal operation or add a capacitor to ground to
extend the reset time.
V
V
CC
CC3
Connect to GND to disable window comparators at APC
SET
RESET
190 Ω
15
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (4 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
8
SCB
Safety Circuit Bypass. Connect to GND or leave open for normal operation.
Connect to VCC to allow the bias and modulation outputs to operate even if the
safety circuitry indicates a fault.
V
V
CC3
CC
(M02061-21
only)
SCB
24 kΩ
48 kΩ
8
DISDLY
Disable delay control. Connect to ground for normal operation. 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.
V
CC
(M02061-12
only)
DISDLY
190 Ω
16
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (5 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
9
MOD
Modulation Current Monitor. Connect directly through a resistor to GND (MON
POL
MON
V
CC
V
high) or to V
(MON
low). The current through this pin is approximately 1/
CC3
POL
CC3
100th of the MODULATION current to the laser.
This pin may be left open if the feature is not needed and the M02061 current
consumption will be reduced by 0.5mA typically.
MOD
MON
190 Ω
10
11
BIAS
See MOD
drawing
Bias Current Monitor. Connect directly through a resistor to GND (MON
high) or
MON
MON
POL
to V
(MON
low). The current through this pin is approximately 1/100th of the
CC3
POL
BIAS current to the laser.
This pin may be left open if the feature is not needed and the M02061 current
consumption will be reduced by 0.5mA typically.
TxPwr
Transmit Power Monitor. Connect directly through a resistor to GND (MON high)
POL
MON
V
CC
V
or to V
(MON
low). The current through this pin is approximately the same as
CC3
CC3
POL
the photo diode current into IPIN.
This pin may be left open if the feature is not needed and the M02061 current
consumption will be reduced by the IPIN current.
TxPwr
MON
33 Ω
17
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (6 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
12
APC
Average Power Control, laser bias current adjustment. Connect a resistor between
this pin and ground to set the bias current to the laser.
SET
V
CC
V
CC3
The APC loop will control the laser bias current to maintain a voltage of
approximately 1.3V at this pin. The current through this pin is approximately the
same as the current into I
.
PIN
APC
SET
13
I
Current input from monitor photodiode anode.
PIN
V
CC
The APC loop will adjust the laser bias current to maintain a voltage at APC
of
SET
approximately 1.3V and at this pin of approximately one V . The voltage at this pin
GS
will not exceed 1.6V in normal operation
IPIN
30 Ω
14
IBIAS
Laser bias current output.
OUT
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, (~2pF).
Maintain a voltage > 0.7V at this pin.
Connect 100 kΩ pullup resistor to VCC if pin 18 (SVCC) is used.
IBIAS
OUT
18
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (7 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
15
GND
Ground for output stage. May be connected directly to ground. At high bit rates
(>2Gb/s) an optional inductor or ferrite may be added to reduce switching
transients.
O
V
CC
GND
0
16
OUT+
Positive modulation current output. Sinks current when D + is HIGH.
IN
V
CC
Maintain a voltage > 1.6V at this pin when VCC3 is high.
SEL
Maintain a voltage > 1.15V at this pin when VCC3 is low.
SEL
OUT+
GND
0
17
18
OUT-
See OUT+ drawing
Negative modulation current output. Sinks current when D - is HIGH
IN
Maintain a voltage > 1.6V at this pin when VCC3 is high.
SEL
Maintain a voltage > 1.15V at this pin when VCC3 is low.
SEL
SV
Switched V .
CC
CC
V
CC
V
3.3V applications - Connect to laser anode. Safety circuitry will open the switch
when a fault is detected and no current will flow through the laser.
CC3
No capacitance is needed on this node. If capacitance to ground is added, do not
exceed 100 pF.
SVCC
5V applications - Disabled, leave open.
19
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (8 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
19
SHDWN
External switched V control signal. Use in 5V applications to create an external
CC
OUT
V
CC
SV
CC.
12 kΩ
SHDWN
OUT
20
C
Automatic power control loop dominant pole capacitor. (Connect a capacitor
APC
V
CC
between this pin and V .)
CC3
A 2.2 nF capacitor will give less than 1ms enable time and a loop bandwidth <
30kHz.
CAPC
100 Ω
21
V
3.3V applications - Power supply input. Connect to V .
CC
CC3
V
V
CC
CC
5V applications - Internally generated 3.3V. Power supply output. Do not attach to
non-M02061 circuitry.
For 5 V applications add 12 ohms in series with 100 nF to ground at this pin.
V
CC3
20
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 2-1.
M02061 Pin Definitions and Descriptions (9 of 9)
4x4 mm
QFN24 Pin
Number
Pin Name
Pin equivalent load
Function
22
PWA
Pulse Width Adjust. Connect a resistor to GND to enable, (between 1kΩ and
20kΩ). Connect to V to disable.
V
V
CC
CC3
CC3
+
-
1.28V
PWA
190 Ω
23
24
MOD
See PWA drawing
See PWA drawing
Modulation current control. Connect a resistor to ground to set the modulation
current.
SET
TC
Modulation current temperature compensation coefficient adjustment. Connect a
resistor to ground to set the temperature compensation coefficient. Leave open to
disable the temperature compensation.
SLOPE
A 51 kΩ resistor will result in a temperature compensation slope of approximately
0.5%/°C.
CENTER
PAD
GND
Connect to GND.
21
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 2-1. QFN24 Pinout Information
19
24
VCC
1
18
SVCC
OUT-
OUT+
DIN+
DIN-
VCC3SEL
DIS
GND0
GND, connect to
PCB ground
IBIASOUT
IPIN
6
13
FAIL
7
12
4mm x 4mm
22
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
3.0 Functional Description
3.1
Overview
The M02061 is a highly integrated, programmable laser driver intended for SFP/SFF module with data rates up to
4.25 Gbps. Using differential PECL data inputs, the M02061 supplies the bias and modulation current required to
drive an edge-emitting laser.
Monitor outputs and internal safety logic in the M02061 combined with the M02088 will support designs requiring
DDMI compliance.
The M02061 includes automatic power control to maintain a constant average laser output power over temperature
and life. In addition, the modulation current can be temperature compensated to minimize variation in extinction
ratio over temperature.
Many features are user-adjustable, including the APC (automatic power control) loop bias control (via a monitor
photo diode), modulation current, temperature compensation control of modulation current, and pulse-width
adjustment. The part may be operated from a 3.3V or 5V supply.
The driver modulation output can be AC, DC, or Differentially coupled to the laser.
Safety circuitry is also included to provide a latched shut-down of laser bias and modulation current if a fault
condition occurs. An internal V
switch provides redundant shutdown when operating the device from a 3.3V
CC
supply. Control is provided to allow for a redundant external switch when operating with a 5V supply, if desired.
Figure 3-1 details the functional blocks and pin signals for the M02061 device.
23
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-1. M02061 Block Diagram
Internal Power Bus
Internal
SV
CC
3.3V reg.
OUT-
OUT+
D
IN
+
Output
Buffer
Laser
Driver
Input
Buffer
D - FF
D
-
IN
GND
0
VCC3 -1.3V
IBIASOUT
IPIN
Safety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
24
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-2. 2.5Gbps Electrical Eye Diagram
7
Conditions: 80mA modulation current, 2 -1 PRBS
25
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-3. 2.5Gbps Filtered Optical Eye Diagram with NEC NX7315UA Laser
7
Conditions: 10dB extinction ratio, 33% eye margin, 2 -1 PRBS
26
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-4. 4.25Gbps Unfiltered Optical Eye Diagram with Archcom AC3460 Laser
7
Conditions: 7.5dB extinction ratio, 2 -1 PRBS
3.2
Features
•
High speed operation; suitable for SFP/SFF applications from 155Mbps to 4.25 Gbps. Typical rise/fall times of
55 ps.
•
Programmable temperature compensation. Modulation output and bias output can be controlled using a few
discrete resistors.
•
•
•
•
•
•
•
Supports DDMI (SFF-8472) diagnostics when combined with the M02088.
DC or AC coupled modulation drive. Up to 100mA modulation current available when AC coupled.
Low overshoot allows high extinction ratio with low jitter.
Automatic Laser Power Control, with “Slow-Start”.
Differential data inputs to minimize pattern dependent jitter, PECL and CML compatible.
Packaged in a QFN24
3.3V or 5V operation
27
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
3.3
General Description
The M02061 is a highly integrated, programmable laser driver intended for SFP/SFF module with data rates up to
4.25 Gbps. Using differential PECL data inputs, the M02061 supplies the bias and modulation current required to
drive an edge-emitting laser. Monitor outputs and internal safety logic support the DDMI requirements.
The M02061 laser driver consists of the following circuitry: an internal regulator, bias current generator and
automatic power control, data inputs, buffer with pulse width adjust, modulation current control, modulator output,
laser fail indication, disable control, and monitor outputs for the bias current, modulation current, and transmitted
power.
3.3.1
Internal Regulator
The M02061 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
CC
approximately 3.3V to the majority of the on-chip circuitry. The on-chip regulator is internally compensated,
requiring no external components. However, for 5V operation with high modulation currents, it may be necessary to
add 12 ohms in series with 100nF to ground at VCC3 or the internal power supply may dip and cause a fault
condition. When a 3.3V supply is used (V
and V
connected to 3.3V) the regulator is switched off and the
CC
CC3
internal circuitry is powered directly through the V
supply pin. The decision as to whether or not the internal
CC3
regulator is required is made via the VCC3
monitor for proper +5V supply voltage.
pin, which also determines whether the safety circuitry needs to
SEL
For 3.3V applications, SV is sourced from V
through a switch (leave SV open for 5V applications). SV is
CC CC
CC
CC3
to be used to power the anode of the laser diode and the cathode of the photo diode, any resistive or ferrite pull-
ups on the OUT+ and OUT- outputs should be connected directly to VCC. When a fault condition is present, FAIL
will assert and the switch sourcing SV will open so no current can pass through the laser. SV does not need
CC
CC
any external capacitance, if capacitance to ground is added at SV it should be <100 pF. When SVCC is used,
CC
add a 100k Ω pullup resistor to VCC at pin 14 (IBIASout).
For 5V operation, an analog switch controlled by SHTDWNOUT can be used to source 5V to the laser anode. In
the case of a fault condition, SHTDWNOUT will go high and open the analog switch which will result in an open
circuit at the laser. SHTDWNOUT is designed to drive a CMOS logic input. An FET transistor may have excessive
Miller capacitance and a fault may be signalled if it turns on too slow.
V
and V
status are internally monitored by the M02061 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
CC
CC3
or modulation current.
28
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 3-1.
Pin Connection for 3.3V and 5V V
CC
Pin Connection For:
VCC = 3.3V
VCC = 5V
Connect to V
Laser Anode
OPEN
Reference for C
OPEN
and PWA
APC
CC
VCC3
SVCC
External safety control switch
Capacitor between C and V
SHDWNOUT
CAPC
Capacitor between C
and V
or V
(not V )
CC3 CC
APC
CC3
CC
APC
Connect to V
Connect to V
or V to disable
Connect to V
to disable (not V )
CC3
CC3
CC
CC3 CC
PWA
or V
Connect to GND
CC
VCC3
SEL
3.3.2
Bias Current Generator and Automatic Power Control
To maintain constant average optical power, the M02061 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 photo diode.
APCSET
The photo current from the monitor photo diode mounted in the laser package is sunk at I . This photo current is
PIN
mirrored and an equivalent current is sourced from pins TxPwr
and APC . The APC loop adjusts the laser
MON
SET
bias current (hence the monitor diode photo current) to maintain a voltage at APC
~1.3V.
of 1 band-gap voltage or
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 photo diode. The larger the C
lower the loop BW.
capacitor the lower the bandwidth of the loop and the larger R
the
APCSET
APC
In general, it is recommended that at least 2.2 nF of external capacitance be added externally between C
and
APC
V
. With use of a 2.2 nF capacitor, the bias current can reach 90% of its final value within 1ms, i.e., bias current
CC3
rise-time is less than 1ms and the APC loop bandwidth is less than 30 kHz, which should be adequate for bit rates
of 155Mbps. (and all higher bit rates).
The bias generator also includes a bias current monitor mirror (BIAS
), whose output current is typically 1/100th
MON
of the bias current. This pin can be connected directly through a resistor to ground. If this function is not needed
this pin can be left open.
3.3.3
Data Inputs
Both CML and PECL inputs signals can be AC coupled to the M02061. These inputs are internally biased to
approximately V - 1.3V. In most applications the data inputs are AC coupled with controlled impedance pcb
CC3
traces which will need to be terminated externally with a 100Ω or 150Ω resistor between the + and - inputs.
29
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
PECL and CML signals may be DC coupled to the M02061 data inputs when both the M02061 and the source of
the input signals are operating from 3.3V supplies. If the M02061 is operating from a 5V supply, PECL and CML
signals may be DC coupled as long as the source of the input signals is operating at a 3.3V supply and the signals
are referenced to VCC3 at the M02061.
3.3.4
Pulse Width Adjust
The data output buffer incorporates pulse-width adjustment control to compensate for laser pulse width distortion.
A potentiometer can be connected between the PWA input and GND for adjustment (programming resistance
should be between 1kΩ and 20kΩ). By adjusting the potentiometer, the pulse-width can be adjusted over a range
of approximately ±40 ps. Pulse width control can be disabled by connecting PWA to V
50% crossing point at the output and reducing supply current by approximately 1.5mA.
, resulting in roughly a
CC3
3.3.5
Modulation Control
There are programmable control lines for controlling the modulation current and its temperature compensation.
These inputs can be programmed simply with a resistor to ground.
The modulation current amplitude is controlled by the MOD
input pin. The modulation current is temperature
SET
compensated by the TC
inputs. The temperature compensation is independent of the setting.
SLOPE
If the temperature compensation at TCSLOPE is disabled, the modulation output current is simply:
IOUT = 100 x (1.3V / R
)
MODSET
Where R
is the resistance from pin MOD
to ground.
SET
MODSET
Figure 3-5 is the most accurate method for selecting RTCslope.
However, you can also select R
using 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 M02061 case temperatures below 10°C.
For example:
Given a laser with a desired modulation current at low temperatures of 30mA and a temperature coefficient of -
0.5%/°C at high temperatures (which will require a laser driver temperature coefficient of +0.5%).
Choose RMODSET = 100 x (1.3V / 30mA) = 4.3kΩ
-1.5
Choose RTCSLOPE =19.5*(0.5)
kΩ = 56kΩ.
30
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-5. TC Slope Compensation Behavior
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
3.3.6
Modulator Output
The output stage is designed to drive a 25Ω output load over a wide range of currents and circuit architectures. The
laser may be AC, DC, or Differentially coupled depending on the supply voltage.
Table 3-2.
Modulation Current Maximums (1 of 2)
Max
Max Bias Current
Modulation Current
V
V
=5V, Laser DC coupled
80
60
60
CC
(1)
=5V, Laser AC coupled
80
CC
31
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Table 3-2.
Modulation Current Maximums (2 of 2)
Max
Max Bias Current
Modulation Current
(2)
V
V
=3.3V, Laser DC coupled
=3.3V, Laser AC coupled
100
100
100
CC
100
CC
When differentially coupling, the maximum modulation and bias current is determined by either the AC or DC coupling of the OUT+ or OUT- output, whichever has
the minimum rating.
1. When AC coupling the output should never be allowed to swing above the absolute voltage rating of the part, which is 6V.
2. When V =3.3V, the OUT+ and OUT- should not be driven below 1.6V. In most 3.3V applications, this will make DC coupling impractical.
CC
When DC coupled, OUT+ should be connected through a series resistor to the laser such that the total impedance
seen at the output is 25 ohms. This will result in the optimum pulse response while allowing the maximum
modulation current (see Figure 4-3).
The output can also be AC coupled to the laser. This is the required operating mode when using a 3.3V supply
(unless the laser has a small forward voltage and OUT+ will not go below 1.6V). When AC coupled the dynamic
resistance seen by OUT+ should still be 25 ohms. In addition to a resistor in series with the laser, a capacitor is
added in series and a ferrite is used to pull up the collector at OUT+ to V
.
CC
When the laser is AC coupled, the OUT- pin is usually tied to the laser anode through an AC coupled series resistor
which matches the impedance seen by the OUT+ pad (see Figure 4-1).
The output stage also has a separate current path to GND labelled GND . This isolates the output switching
0
currents from the rest of the system.
32
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-6. Modulator Output
*
*
0.75 nH
0.75 nH
OUT-
0.4pF
OUT+
For VCC =5V, OUT+ and OUT-
should not be driven below 1.15V
For VCC = 3.3V, OUT+ and OUT-
should not be driven below 1.6V.
GND
A
(optional
external
inductance)
* Denotes bond
wire internal to
MLF package
3.3.7
Fail Output
The M02061 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 M02061 loses power the pull-up will 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.
3.3.8
TX Disable and Disable Delay Control
The DIS pin is used to disable the transmit signal (both the modulation and bias current are disabled when DIS =
high).
The DIS input is compatible with TTL levels regardless of whether VCC = 5V or VCC = 3.3V. The external 4.7kΩ
and 10kΩ pull-up resistor required by most interface standards is not needed because this pin has an internal 7kΩ
resistor to V
.
CC
33
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
The DISDLY pin is used in conjunction with the DIS pin to control bias current enable time. In normal operation the
DISDLY pin should be connected to ground. In this case, each time DIS transitions from high to low the bias current
will be enabled by the “slow-start” circuitry (enable time of less than 1 ms with a C
= 2.2 nF).
APC
For burst mode operation a capacitor C is added to the DISDLY pin, the slow-start circuitry is disabled for
6
approximately T = 3 * 10 (sec/F) * C (F) following the DIS high transition (see figure 8). If the part is enabled (DIS
transitions low) during this time the bias and modulation current will quickly return to within 90% of their final value
(in less than 500ns). If DIS transitions low after the DISDLY 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
capacitor value).
APC
34
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 3-7. DIS and DISDLY Timing
EPON Burst Mode Operation
DIS
DISDLY
IBIASOUT
OUT+
t_onBM < 500ns for IMOD > 10mA
t_offBM < 500ns
Normal Operation, (slow-start whenever part enabled)
DIS
DISDLY
IBIASOUT
OUT+
t_on< 1ms, depending on C
APC
t_off< 10μs
35
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
3.3.9
TX Disable Control
The DIS pin is used to disable the transmit signal (both the modulation and bias current are disabled when DIS =
high).
The DIS input is compatible with TTL levels regardless of whether VCC = 5V or VCC = 3.3V. The external 4.7kΩ
and 10kΩ pull-up resistor required by most interface standards is not needed because this pin has an internal 7kΩ
resistor to V
.
CC
3.3.10
Monitor Outputs
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
). These pins should be terminated with a resistor to ground that sets the desired
MON
full-scale voltage (not to exceed V
-1V). Using a monitor polarity selection (MON
) these monitors can be set
CC3
POL
to sink current instead of source current. They will then need to be terminated with a resistor to V
induced voltage should not exceed 2.5V.
and the
CC3
If the outputs of these monitors are not needed, MON
, TxPwr
, BIAS
, and MOD
can all be left
MON
POL
MON
MON
floating and the 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
manufacturer since the application of this device cannot be controlled by MACOM.
3.4.1
Safety Circuitry
On the M02061-12 with DISDLY on pin 8, SCB is internally bonded to ground so SCB is always in a logic low state.
When SCB is high the OUTP, BIASout and SVCC outputs will not be disabled when FAIL asserts (FAIL goes high).
The outputs are only disabled by making DIS high.
The FAIL output will also ignore much of the safety sensing circuitry when SCB is high. However, it will monitor the
state of the window comparators at pin APC . The bias current is controlled to nominally maintain the voltage at
SET
APC
to 1.3V. The threshold levels at the window comparators around APC
are specified by the parameters
SET
SET
V
and V as shown in the table below. This provides the same level of eye safety protection as our previous
BH
BL
generation of laser drivers. The current sourced out of pin APC
is equal to the current into pin I
sourced from
SET
PIN
the laser monitor photo diode. If the laser is emitting excess power this will be reflected in the I
current and the
PIN
voltage at APC
will go high and the FAIL pin will assert. If I
is not connected to the laser monitor photo diode
SET
PIN
then the voltage at APC
will fall and FAIL will assert.
SET
When SCB is low, safety circuitry in the M02061 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 the laser (SV or
CC
36
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Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
an external switch controlled by SHDWN
passing through the laser.
) will immediately go open circuit and prevent any current from
OUT
Fault conditions checked by the M02061 include shorts to ground or V of all pins which can increase the laser
CC
modulation or bias current.
For an initialization 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 3-8. Safety Circuit Block Diagram, for SCB Pin Low
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:
VCC_OK
Start
OR
SRlatch
Reset
PULSE
3.3v Mode:
t=0
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:
OutP
> 300mV
> 300mV
> 300mV
Window Compare:
Capc
MODset
HI Limit
CrudeFaults_OK
IBout
> 300mV
MPCset
OR
BIAS_OK
LOW Limit
1.The one-shot is actually comprised of an oscillator and 10-bit counter.
37
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
http://www.macom.com/support
M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
3.5
Fault Conditions when SCB is Low
This section describes the M02061 operating modes during fault conditions. Over voltage, under
voltage, pins shorted to VCC and pins shorted to ground are included in the fault table.
1 2
Table 3-3.
Circuit Response to Single-point Fault Conditions, when SCB is Low
(1 of 2)
Circuit Response to Over-voltage Condition
or Short to VCC
Circuit Response to Under-Voltage Condition
or Short to Ground
Pin Name
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
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
(1, 2)
(1, 2)
fault state occurs.
fault state occurs.
VCC3
Does not affect laser power.
Does not affect laser power.
SEL
DIS
Bias and modulation outputs are disabled.
Does not affect laser power (normal condition for circuit operation).
3.3V operation - SV is opened.
CC
5V operation - SHDWN
goes high.
OUT
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
(1)
(1)
APC
A fault state occurs.
A fault state occurs.
SET
(1)
(1)
I
A fault state occurs.
A fault state occurs.
PIN
(1)
(1)
IBIAS
The laser will be turned off, then a fault state occurs.
A fault state occurs.
OUT
(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
P
coupled. If the set output power can not be obtained, a fault state
(1, 2)
occurs.
OUT
Does not affect laser power.
Does not affect laser power.
N
CC
(1)
SV
Does not affect laser power.
Laser bias current will be shut off and a fault state occurs.
(1)
(1)
C
Laser bias current will be shut off, then a fault state occurs.
A fault state occurs.
APC
CC3
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
PWA
Does not affect laser power.
Does not affect laser power
SHDWN
Does not affect laser power. if this pin is used to control an external Does not affect laser power.
switch, laser current is disabled and fault state occurs.
OUT
(1)
(1)
MOD
The APC loop will attempt to compensate for the change in output A fault state occurs.
SET
power. If the APC loop can not maintain the set average power, a
(1, 2)
fault state occurs.
38
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
http://www.macom.com/support
M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
1 2
Table 3-3.
Circuit Response to Single-point Fault Conditions, when SCB is Low
(2 of 2)
Circuit Response to Over-voltage Condition
or Short to VCC
Circuit Response to Under-Voltage Condition
or Short to Ground
Pin Name
TC
Does not affect laser power.
May affect laser power. If this is the case, 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 fault state occurs.
SLOPE
(1, 2)
SCB
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
DISDLY
NOTES:
1. A fault state will assert the FAIL output, disable bias and modulation outputs and will either open the switch at SV (3.3V operation) or SHDWN
will go
OUT
CC
high (5V operation).
2. Does not affect laser power when the output is AC coupled to the laser.
39
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Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
4.0 Applications Information
4.1
General
•
•
•
SFP and SFF Modules
1G/2G/4G Fibre Channel modules
Short reach and Metro SONET/SDH
Figure 4-1 and Figure 4-3 illustrate typical applications for 3.3/AC coupled and 5V/DC coupled laser.
Figure 4-1. Application Diagram, VCC = 3.3V Laser AC Coupled Example
VCC
VCC3
VCC
V
CC
SV
CC
Internal Power Bus
Internal
3.3V reg.
OUT-
D
+
IN
Input
Buffer
Output
Buffer
Laser
Driver
OUT+
D - FF
D
IN
-
GND
0
VCC
100k
VCC3 -1.3V
IBIAS
OUT
IPIN
Input
Buffer
Safety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
VCC3
VCC
(M02061-12
only)
(M02061-21
only)
40
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 4-2. Application Diagram, VCC = 3.3V Laser AC Coupled with Recommended Component Values
VCC
100kΩ
Pin 14 (IBIASout)
M02061
VCC
600Ω
ferrite
600Ω
ferrite
0.1uF
24Ω
24Ω
Laser
cathode
Pin 16 (OUT+)
Pin 17 (OUT-)
DNI
150Ω
if needed
150Ω
2.2pF
Laser
anode
0.1uF
600Ω
ferrite
600Ω
ferrite
VCC
Pin 18 (SVCC)
41
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 4-3. Application Diagram, VCC = 5V Laser DC Coupled Example
V
CC
VCC=5V
VCC3
VCC3
SPST switch
SV
CC
Internal Power Bus
Internal
3.3V reg.
OUT-
D
IN
+
Input
Buffer
Output
Buffer
Laser
Driver
OUT+
D - FF
D
-
IN
GND
0
VCC3 -1.3V
IBIAS
OUT
IPIN
Input
Buffer
Safety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
VCC3
VCC
(M02061-12
only)
(M02061-21
only)
4.2
Video Operation
The M02061 can be used to transmit digital video optical data even in the presence of the pathological signal. 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 3 points in a laser driver schematic: the data inputs, the APC control, and coupling the
modulation current to the laser. In the M02061 DC coupling can be used at all 3 of these points.The data inputs can
be DC coupled using PECL or CML levels (see Section 3.3.3, “Data Inputs”). LVDS signals can be DC coupled with
level shifting.The APC of the bias current is controlled by feedback from the monitor photo diode in the laser
package in most communications applications. In video applications this monitor photo diode 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 photo diode is not used). In the open loop configuration the APC is controlled by a
resistor or a thermistor network or a look-up table. This removes AC time constants from the bias current. In
Figure 4-4 the BIASmon pin is connected to the APCset pin. In this case the bias current is IBIAS = 100 x (1.3V /
RAPCset). The modulation current output OUT+ can be DC coupled to the laser as shown in Figure 4-4. There are
no AC time constants in the modulation current amplitude in this configuration.
42
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
Figure 4-4. Video Application Block Diagram
V
CC
VCC=5V
VCC3
VCC3
SPST switch
Internal Power Bus
SV
CC
Internal
3.3V reg.
OUT-
D
+
IN
Input
Buffer
Output
Buffer
Laser
Driver
OUT+
D - FF
D
-
IN
GND
0
VCC3 -1.3V
IBIAS
OUT
IPIN
Input
Buffer
Safety
Circuitry with
Latched Fault
TX
Disable
Modulation
Control
Automatic Power Control
(laser bias current)
VCC3
VCC
(M02061-12
only)
(M02061-21
only)
43
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For further information and support please visit:
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M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
5.0 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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For further information and support please visit:
http://www.macom.com/support
M02061-12/-21
3.3 or 5 Volt Laser Driver
Rev V6
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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Visit www.macom.com for additional data sheets and product information.
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