The MAX3850 is a +3.3V DC-coupled laser driver for
SDH/SONET applications up to 2.7Gbps. The device
accepts differential data and clock inputs and provides
bias and modulation currents for driving a laser. If a
clock signal is available, a synchronizing input latch
can be used to reduce jitter. An automatic power-control
(APC) feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range of 5mA to
60mA (up to 80mA AC-coupled) and bias current of
1mA to 100mA are easy to program, making this product
ideal for SDH/SONET applications. The MAX3850
also provides laser current-enable control, two current
monitors that are directly proportional to the laser bias
and modulation currents, and a failure-monitor output to
indicate when the APC loop is unable to maintain the
average optical power. Designed to be DC-coupled to
the laser with a supply voltage of only 3.3V, the
MAX3850 greatly simplifies interface requirements. The
MAX3850 is available in a small 32-pin QFN package
as well as dice.
Key Features
Applications/Uses
Single +3.3V Power Supply
35mA Supply Current
Programmable Bias Current from 1mA to 100mA
Programmable Modulation Current from 5mA to
60mA (Up to 80mA AC-Coupled)
Bias Current and Modulation Current Monitors
70ps Rise/Fall Time
Automatic Average Power Control with Failure
Monitor
Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
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