SY88922KCTR [MICREL]
SDH/SONET 2.5Gbps LASER DIODE DRIVER; SDH / SONET 2.5Gbps的激光二极管驱动器
| 型号： | SY88922KCTR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | SDH/SONET 2.5Gbps LASER DIODE DRIVER |
| 文件： | 总8页 (文件大小：87K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SDH/SONET 2.5Gbps
LASER DIODE DRIVER
SY88922
FEATURES
DESCRIPTION
■ Up to 2.5Gbps operation
The SY88922 is a high-speed current switch for driving
a semiconductor laser diode in optical transmission
applications. The output current, or modulation current
IMOD, is DC current controlled by IRSET, current through
the resistor RSET. The output OUT is HIGH when output
enable is HIGH.
■ 25mA peak drive current
■ Separate modulation control
■ Separate output enable for laser safety
■ Differential inputs for data
The device incorporates complementary open collector
outputs with a capability of driving peak current of 25mA.
The resistor REXT must be placed between /OUT and
VCC to dissipate the worst case power. RSER is
recommended to compensate for laser diode matching
issues.
■ 75KΩ input pulldown resistor
■ Designed for use with SY88923, SY88904 or SY88905
■ Available in a tiny 10-pin (3mm) MSOP
The SY88922 utilizes the high performance bipolar
ASSET™ technology.
APPLICATIONS
PIN CONFIGURATIONS
■ 1.25Gbps Gigabit Ethernet
■ 531Mbps and 1062Mbps Fibre Channel
■ 622Mbps SONET
/EN
1
2
3
4
5
10 VCC
D
IN
/DIN
REF
SET
9
8
7
6
OUT
/OUT
GND
GND
MSOP
K10-1
■ Gigabit Interface Converter
■ 2.5Gb/s SDH/SONET
V
R
BLOCK DIAGRAM
V
CC
REXT
OUT
OUT
RSER
DIN
Internal Logic
DIN
to Laser Diode
I
MOD
EN
BIAS
Control
40X
V
CC
GND
Modulation Control
GND
RSET
V
REF
RSET
Rev.: B
Amendment:/1
1
Issue Date: July 2000
Micrel
SY88922
(1)
PIN NAMES
TRUTH TABLE
Pin
Function
D
D
H
L
/EN
L
OUT(2)
/OUT
VCC
Most positive power supply input, +5V for PECL
operation.
L
H
L
L
H
L
H
X
L
GND
Ground
X
H
H
DIN, /DIN
These differential PECL 100K compatible inputs
receive NRZ data.
NOTES:
1. L = LOW, H = HIGH, X = don't care
2. H = IOUT = 0mA
/EN
This PECL 100K compatible input enables
Laser Driver. Modulation current goes to zero
when asserted HIGH.
OUT, /OUT
Open collector outputs from the modulation
buffer drive these differential current outputs.
VREF
RSET
Voltage reference for use with RSET.
An external resistor sets up the source current
for modulation Imod.
(1)
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VI
Rating
Value
0 to +7.0
0 to VCC
25
Unit
V
Power Supply Voltage
Input Voltage
V
IO
Output Current
mA
°C
TA
Operating Temperature Range
Storage Temperature Range
Power Dissipation
0 to +85
–55 to +125
250
Tstore
Ptot
°C
mW
NOTE:
1. PermanentdevicedamagemayoccurifABSOLUTEMAXIMUMRATINGSareexceeded. Thisisastressratingonlyandfunctionaloperationisnotimplied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended
periods may affect device reliability.
(1)
OPERATIONING CONDITIONS
Symbol
VCC
Rating
Value
+4.5 to +5.5
10 to 50
Unit
V
Power Supply Voltage
REXT
RSER
RSET
ΘJA
Resistor to Dissipate Power
Ω
Laser Diode Serial Resistor
0 to 50
Ω
Resistor to Adjust Current
1500 to 50,000
113
Ω
Thermal Resistance of Package to Ambient(2)
Capacitance on OUT + /OUT
°C/W
pf
COUT
2.5 typical
NOTES:
1. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 2V.
2. Still air without heatsink.
2
Micrel
SY88922
DC ELECTRICAL CHARACTERISTICS
GND = 0V; VCC = +5.0V ±10%; TA = 0°C to + 85°C
TA = 0°C
TA = +25°C
TA = +85°C
Symbol
Parameter
Min.
Typ.
—
Max.
Min.
CC–1165
Typ.
Max.
Min.
CC–1165
Typ.
Max.
Unit
VIH
Input HIGH Voltage
(DIN, /DIN, /EN)
V
V
CC–1165
V
CC–880
V
—
V
CC–880
V
—
VCC–880 mV
VIL
Input LOW Voltage
(DIN, /DIN, /EN)
CC–1810
—
V
CC–1475 VCC–1810
—
V
CC–1475 VCC–1810
—
VCC–1475 mV
VREF
IIL
Reference Voltage
—
3.12
—
—
—
3.00
—
—
—
2.80
—
—
V
Input LOW Current(1)
(DIN, /DIN, /EN)
0.5
—
0.5
—
0.5
—
uA
IIH
Input HIGH Current
(DIN, /DIN, /EN)
—
—
100
—
—
100
—
—
100
uA
ICC
IOL
Supply Current(2)
—
—
16
25
—
—
16
25
—
—
16
25
mA
uA
Output LOW Current
(/EN = HIGH)
—
500
—
500
—
500
IOUT
IRSET
Modulation Current
Modulation Control
=IOUT/IRSET
5
15
—
38
25
0.625
44
5
15
—
38
25
0.625
44
5
15
—
38
25
0.625
44
mA
mA
—
0.125
30
0.125
30
0.125
30
ARSET
NOTES:
1. VI = VIL(Min.)
2. IMOD = 25mA.
(1)
AC ELECTRICAL CHARACTERISTICS
IMOD =10mA; GND = 0V; VCC = +5V ±10%; TA = 0°C to + 85°C
TA = 0°C TA = +25°C
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
TA = +85°C
Symbol
Parameter
Conditions
tpd D
Propagation Delay
DIN - OUT
—
—
—
—
—
—
—
—
1000
1000
160
10
—
—
—
—
500 1000
—
—
—
—
—
—
—
—
1000
1000
160
10
ps
ps
ps
%
tpd EN
Propagation Delay
/EN - OUT
450 1000
tr
tf
Rise/Fall Time
(20% to 80%)
110
160
10
Load = 25Ω
IOR
Output Current Ringing(2)
—
NOTES:
1. REXT = RSER = 25Ω ±1%, RSER connects to VCC directly without Laser Diode.
2. IOH = 5 to 25mA
3
Micrel
SY88922
PERFORMANCE CURVES
IO and RSET
30
25
20
15
10
5
0.0
8.0K
10K
4.0K
12K
2.0K
6.0K
0.0
RSET (ohm)
PRODUCT ORDERING CODE
Ordering
Code
Package
Type
Operating
Range
SY88922KC
K10-1
K10-1
Commercial
Commercial
SY88922KCTR
4
Micrel
SY88922
APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION
GBIC Terminal
130Ω
130Ω
82Ω
82Ω
200Ω
200Ω
68Ω
68Ω
REXT
24Ω
Laserdiode
20kΩ
BLM21A102S
0.1µF
130Ω
82Ω
Photodiode
1000pF
130Ω
82Ω
5
Micrel
SY88922
10 LEAD MSOP (K10-1)
Rev. 00
6
Micrel
SY88922
7
Micrel
SY88922
MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
8
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