The MAX3646 is a +3.3V laser driver designed for multirate transceiver modules with data rates from 155Mbps to 622Mbps. Lasers can be DC-coupled to the MAX3646 for reduced component count and ease of multirate operation.Laser extinction ratio control (ERC) combines the features of automatic power control (APC), modulation compensation, and built-in thermal compensation. The APC loop maintains constant average optical power. Modulation compensation increases the modulation current in proportion to the bias current. These control loops, combined with thermal compensation, maintain a constant optical extinction ratio over temperature and lifetime.The MAX3646 accepts differential data input signals. The wide 5mA to 60mA (up to 85mA AC-coupled) modulation current range and up to 100mA bias current range, make the MAX3646 ideal for driving FP/DFB lasers in fiber optic modules. External resistors set the required laser current levels. The MAX3646 provides transmit disable control (TX_DISABLE), single-point fault tolerance, bias-current monitoring, and photocurrent monitoring. The device also offers a latched failure output (TX_FAULT) to indicate faults, such as when the APC loop is no longer able to maintain the average optical power at the required level. The MAX3646 is compliant with the SFF-8472 transmitter diagnostic and SFP MSA timing requirements.The MAX3646 is offered in a 4mm x 4mm, 24-pin thin QFN package and operates over the extended -40°C to +85°C temperature range.Applications125Mbps Ethernet SFP, GBIC, and 1 x 9 TransceiversMultirate OC-3 to OC-12 FEC Transceivers

The MAX3735A is a +3.3V laser driver for SFP/SFF applicationsfrom 155Mbps up to 2.7Gbps. The device acceptsdifferential input data and provides bias and modulationcurrents for driving a laser. DC-coupling to the laser allowsfor multirate applications and reduces the number of externalcomponents. The MAX3735A is fully compliant with theSFP MSA timing and the SFF-8472 transmit diagnosticrequirements.An automatic power-control (APC) feedback loop is incorporatedto maintain a constant average optical power overtemperature and lifetime. The wide modulation currentrange of 10mA to 60mA (up to 85mA AC-coupled) and biascurrent of 1mA to 100mA make this product ideal for drivingFP/DFB laser diodes in fiber-optic modules. The resistorrange for the laser current settings is optimized to interfacewith the DS1858 SFP controller IC.The MAX3735A provides transmit-disable control, asingle-point latched transmit-failure monitor output, photocurrentmonitoring, and bias-current monitoring to indicatewhen the APC loop is unable to maintain the averageoptical power.The MAX3735A is available in a 4mm x 4mm TQFN packageand operates over the extended temperature range of -40°C to +85°C.Applications1G/2G Fibre Channel SFF/SFP Optical Transceiver ModulesGigabit Ethernet SFF/SFP Transceiver ModulesMultirate OC-3 to OC-48 FEC SFF/SFP Transceiver Modules

The MAX3736 is a compact, +3.3V multirate laser driver for SFP/SFF applications up to 3.2Gbps. The device accepts differential data and provides bias and modulation currents for driving a laser. DC-coupling to the laser allows for multirate applications, and reduces the number of external components.The wide 5mA to 60mA (85mA AC-coupled) modulation current range and 1mA to 100mA bias current make the MAX3736 ideal for driving FP/DFB laser diodes in fiber optic modules. The laser current setting can be controlled by a current DAC, a voltage DAC, or a resistor. Very low power dissipation, small package size, and reduced component count, make this part an ideal solution for SFP-module applications.The MAX3736 is available in a small 3mm x 3mm, 16-pin thin QFN package. It operates over a -40° to +85° temperature range.Applications10G Ethernet LX4 Modules1G/2G Fibre Channel SFF/SFP Transceiver ModulesGigabit Ethernet SFF/SFP Transceiver ModulesMultirate OC-3 to OC-48 FEC SFF/SFP Transceiver Modules

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