MAX3646ETG+T

激光二极管驱动器, SFP/SFF光模块, 3.3V电源, TQFN-24

The is a 155Mbps to 622Mbps SFF/SFP laser driver with extinction ratio control in 24 pin TQFN package. The MAX3646 is a +3.3V laser driver designed for multirate transceiver module 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 combines the features of automatic power control, 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. It accepts differential data input signals. External resistors set the required laser current levels. It provides transmit disable control TX_DISABLE, single-point fault tolerance, bias-current monitoring and photocurrent monitoring.

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Power-supply current is 47mA

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Operating temperature range from -40°C to 85°C

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Modulation current is 85mA

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Bias current is 100mA

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Latched failure output TX_FAULT to indicate faults

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Compliant with the SFF-8472 transmitter diagnostic and SFP MSA timing requirements

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On-chip temperature compensation

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Self-biased inputs for AC-coupling

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Ground referenced current monitors

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Laser shutdown and alarm outputs