The MAX3740A is a high-speed VCSEL driver for smallform-factor (SFF) and small-form-factor pluggable (SFP)fiber optic LAN transmitters. It contains a bias generator,a laser modulator, and comprehensive safety features.The automatic power control (APC) adjusts thelaser bias current to maintain average optical powerover changes in temperature and laser properties. Thedriver accommodates common cathode and differentialconfigurations.The MAX3740A operates up to 3.2Gbps. 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 MAX3740A interfaces with the DallasDS1858 to meet SFF-8472 timing and diagnosticrequirements. The MAX3740A accommodates variousVCSEL packages, including low-cost TO-46 headers.The MAX3740A safety circuit detects faults that couldcause hazardous light levels and disables the VCSELoutput. The safety circuits are compliant with SFF andSFP multisource agreements (MSA).The MAX3740A is available in a compact 4mm ✕ 4mm,24-pin thin QFN package and operates over the -40°Cto +85°C temperature range.ApplicationsMultirate (1Gbps to 3.2Gbps) SFP/SFF ModulesGigabit Ethernet Optical TransmittersFibre Channel Optical TransmittersInfiniband Optical Transmitters
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