Laser Drivers 155-622Mbp SFF/SFP

The MAX3869 is a complete, single +3.3V laser driverfor SDH/SONET applications up to 2.5Gbps. Thedevice accepts differential PECL data and clock inputsand provides bias and modulation currents for driving alaser. A synchronizing input latch can be used (if aclock signal is available) to reduce jitter.An automatic power control (APC) feedback loop isincorporated to maintain a constant average opticalpower over temperature and lifetime. The wide modulationcurrent range of 5mA to 60mA and bias current of1mA to 100mA are easy to program, making this productideal for use in various SDH/SONET applications.The MAX3869 also provides enable control, two currentmonitors that are directly proportional to the laser bias andmodulation currents, and a failure-monitor output to indicatewhen the APC loop is unable to maintain the averageoptical power. The MAX3869 is available in 32-pin TQFPand small 32-pin QFN packages as well as dice.Applications2.5Gbps Optical TransmittersAdd/Drop MultiplexersDigital Cross-ConnectsSection RegeneratorsSONET/SDH Transmission Systems

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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 emitter-coupled 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 single-supply 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 theaverage power. The MAX3656 can be configured for nonburst-mode applications (continuous mode) by connecting burst enable (BEN) high. For power saving, theMAX3656 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.ApplicationsAPON, EPON, and GPON Upstream TransmittersFiber-to-the-Home (FTTH) and Fiber-to-the-Business (FTTB) Broadband Access SystemsPassive Optical Network (PON) Transmitters

Laser Drivers 155Mbps to 4.25Gbps SFF/SFP Laser Driver