The MAX3795 is a high-speed VCSEL driver for smallform-factor (SFF) and small-form-factor pluggable (SFP)fiber optic transmitters. It contains a bias generator, alaser modulator, and comprehensive safety features.The automatic power control (APC) adjusts the laserbias current to maintain average optical power overchanges in temperature and laser properties. The driveraccommodates common-cathode and differentialconfigurations.The MAX3795 operates up to 4.25Gbps. It can switchup to 15mA of laser modulation current and source upto 15mA of bias current. Adjustable temperature compensationis provided to keep the optical extinctionratio within specifications over the operating temperaturerange. The MAX3795 interfaces with the DallasDS1856/DS1859 to meet SFF-8472 timing and diagnosticrequirements. The MAX3795 accommodates variousVCSEL packages, including low-cost TO-46 headers.The MAX3795 safety circuit detects faults that couldcause hazardous light levels and disables the VCSELoutput. The safety circuits are compliant with SFF andSFP multisource agreements (MSAs).The MAX3795 is available in a compact 4mm ✕ 4mm,24-pin thin QFN package and operates over the -40°Cto +85°C temperature range. The MAX3795 is pin-forpincompatible with the MAX3740A and is available inlead-free packages.ApplicationsMultirate (1Gbps to 4.25Gbps) SFP/SFF ModulesGigabit Ethernet Optical TransmittersFibre-Channel Optical Transmitters
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