The MAX3865† is designed for direct modulation of laser
diodes at data rates up to 2.5Gbps. It incorporates two
feedback loops, the automatic power-control (APC)
loop and the automatic modulation-control (AMC) loop,
to maintain constant average optical output and extinction
ratio over temperature and laser lifetime. External
resistors or current output DACs may set the laser output
levels. The driver can deliver up to100mA of laser
bias current and up to 60mA laser modulation current
with a typical (20% to 80%) edge speed of 84ps.
The MAX3865 accepts differential clock and data input
signals with on-chip 50Ω termination resistors. The inputs
can be configured for CML or other high-speed logic. An
input data-retiming latch can be enabled to reject input
pattern-dependent jitter when a clock signal is available.
The MAX3865 provides laser bias current and modulation
current monitors, as well as a failure detector, to indicate
the laser operating status. These features are all implemented
on an 81mil x 103mil die; the MAX3865 is also
available as a 32-pin QFN package.
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