The MAX3656 is a burst-mode laser driver that operates
at data rates from 155Mbps up to 2.5Gbps. The
laser driver accepts either positive-referenced emittercoupled
logic (PECL) or current-mode logic (CML) data
inputs and provides bias and modulation current for the
laser diode. The device can switch the laser diode from
a completely dark (off) condition to a full (on) condition
(with proper bias and modulation currents) in less than
2ns. The MAX3656 incorporates DC-coupling between
laser driver and laser diode and operates with a singlesupply
voltage as low as +3.0V.
A digital automatic power-control (APC) loop is provided
to maintain the average optical power over the full temperature
range and lifetime. The APC loop is functional
for a minimum burst on-time of 576ns and minimum
burst off-time of 96ns, with no limit on the maximum
burst on- or off-time. A fail monitor is provided to indicate
when the APC loop can no longer maintain the
average power. The MAX3656 can be configured for
nonburst-mode applications (continuous mode) by connecting
burst enable (BEN) high. For power saving, the
MAX3656 provides enabling and disabling functionality.
The modulation current can be set from 10mA to 85mA
and the bias current can be set from 1mA to 70mA.
The MAX3656 is packaged in a small, 24-pin, 4mm x
4mm thin QFN package and consumes only 132mW
(typ), excluding bias and modulation currents.
Key Features
Applications/Uses
Multirate Operation from 155Mbps to 2.5Gbps
Burst Enable/Disable Delay <2ns
Burst On-Time of 576ns to Infinity
Infinite Bias-Current Hold Time Between Bursts
DC-Coupled Operation with Single +3.3V Power
Supply
40mA Typical Supply Current
Programmable Bias Current from 1mA to 70mA
Programmable Modulation Current from 10mA
to 85mA
Automatic Average Power Control with Failure
Monitor (No CAPC Capacitor Needed)
APC Loop Initialization <3 Bursts
APON, EPON, and GPON Upstream Transmitters
Fiber-to-the-Home (FTTH) and Fiber-to-the-Business (FTTB) Broadband Access Systems
Notes: *This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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