The MAX3643 burst-mode laser driver provides bias
and modulation current drive for PON burst-mode ONT
applications. It is specifically designed for use with a
low-cost external controller for the APC (and if desired,
AMC) loop. A high-speed differential burst-enable input
enables the driver to switch the laser from a dark (output
off) condition to full on condition in less than 2ns.
When BEN is inactive, typical modulation and bias currents
are 5µA each.
Laser modulation current can be set from 10mA to 85mA
and bias current can be set from 1mA to 70mA using the
MODSET and BIASSET inputs. A sample-and-hold circuit
is provided to capture the monitor diode output during
short PON bursts, if needed, and the BEN high-speed
signal is mirrored on an LVCMOS output to be used by
the controller operating the APC/AMC loop.
The MAX3643 burst-mode laser driver is packaged in a
4mm x 4mm, 24-pin thin QFN package. It operates from
-40°C to +85°C.
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