UX 2208
155Mbps to 622Mbps Laser Driver
Features
General Description
+3.0V to +5.5V Supply Voltage
Automatic Power Control
The UX2208 is a complete CMOS laser driver for
155Mbps to 622Mbps.It consists of a bias current
generator with automatic power control (APC), a
modulation current driver and a reference
Temperature-Compensated Modulation
Current
Programmable slow start
voltage
generator
with
temperature
Rise and Fall Times less than 600ps
Apply to FP、DFB、VCSEL Laser Diode
compensation. The UX2208 accepts differential
PECL inputs and provides complementary output
currents. The APC feature allows an optical
transmitter to maintain constant average optical
power by a monitor photodiode, despite changes
in laser efficiency with temperature and lifetime.
A temperature stabilized reference voltage is
provided to simplify laser current programming.
Utilizing a resistor at the IMODTC pin can
compensate the reduction in slope efficiency of
typical laser diodes caused by increased
temperature.
Pin Configuration
Figure 1. Pin Configuration QFN 24
Typical Application Circuit
Figure 2. Typical Application Circuit
2006 Preliminary Datasheet
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