MAX3656D

Fiber-to-the-Home (FTTH) and Fiber-to-the-Business (FTTB) Broadband Access Systems Passive Optical Network (PON) Transmitters APON, EPON, and GPON Upstream Transmitters

The MAX3656D 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 MAX3656D 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 MAX3656D 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 of MAX3656D 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 MAX3656D can be configured for nonburst-mode applications (continuous mode) by connecting burst enable (BEN) high. For power saving, the MAX3656D 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 MAX3656D is packaged in a small, 24-pin, 4mm ✕ 4mm thin QFN package and consumes only 132mW (typ), excluding bias and modulation currents.