SY88922V_06 Datasheet, PDF (1/5 Pages) Micrel Semiconductor – 5V/3.3V 2.5Gbps LASER DIODE DRIVER

Micrel, Inc.
5V/3.3V 2.5Gbps
LASER DIODE DRIVER
SY88922V
SY88922V
FEATURES
■ Up to 2.5Gbps operation
■ 30mA modulation current
■ Separate modulation control
■ Separate output enable for laser safety
■ Differential inputs for data
■ 75KΩ input pull-down resistor
■ 3.3V and 5V power supply options
■ Available in a tiny 10-pin (3mm × 3mm) MSOP
APPLICATIONS
■ 1.25Gbps and 2.5Gpbs Gigabit Ethernet
■ 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel
■ 622Mbps SONET
■ Gigabit Interface Converter
■ 2.5Gbps SDH/SONET
■ 2.5Gbps Proprietary Links
DESCRIPTION
The SY88922V is a high-speed current switch for
driving a semiconductor laser diode in optical transmission
applications. The modulation current (I_OUT) is controlled
by the current (I_RSET) through the external resistor R_SET.
The output OUT is HIGH when output enable is HIGH.
The device incorporates complementary open collector
outputs with a capability of driving peak current of 30mA.
The resistor R_EXT must be placed between /OUT and
V_CC to dissipate the worst case power. R_SER is
recommended to compensate for laser diode matching
issues. Pin 9 and pin 10 should be connected to achieve
better performance.
The SY88922V utilizes the high-performance bipolar
ASSET™ technology.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
BLOCK DIAGRAM
V_CC
R_EXT
/OUT
D_IN
/D_IN
/EN
ASSET is a trademark of Micrel, Inc.
M9999-091906
[e-mail] or [phone]
Internal Logic
BIAS
Control
I_MOD
40X
V_REF
Modulation Control
GND
R_SET
R_SET
1
OUT
R_SER
to Laser Diode
V_CC
GND
Rev.: F Amendment: /0
Issue Date: September 2006