SY88822V Datasheet, PDF (1/5 Pages) Micrel Semiconductor – LASER DIODE DRIVER WITH OUTPUT ENABLE

Micrel
5V/3.3V 155Mbps
LASER DIODE DRIVER
WITH OUTPUT ENABLE
SY88822V
SY88822V
FEATURES
s Single 3.3V or 5V power supply
s Up to 155Mbps operation
s Modulation current to 30mA
s PECL output enable
s Differential PECL inputs
s Available in a tiny 10-pin (3mm) MSOP
APPLICATIONS
s 155Mbps SONET
DESCRIPTION
The SY88822V 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 and no current flows through OUT
when output enable is HIGH.
The device incorporates complementary open collector
outputs with a 30mA maximum current driving capability.
The external 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 SY88822V utilizes the high performance bipolar
ASSET™ technology.
FUNCTIONAL BLOCK DIAGRAM
V_CC
R_EXT
/OUT
DIN
/DIN
/EN
Internal
Logic
I_MOD
40X
V_REF
R_SET
GND
R_SET
ASSET is a trademark of Micrel, Inc.
1
OUT
R_SER
to Laser Diode
V_CC
GND
Rev.: A Amendment: /0
Issue Date: March 2003