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Multirate laser driver with extinction ratio control

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MAXIM Integrated Products, represented in Australia by Arrow Electronics, has released the MAX3738, a multirate laser driver that features extinction ratio control to help reduce manufacturing costs.

The MAX3738 operates from 1Gbps to 2.7Gbps and can be ac or dc-coupled to the laser diode for use in OC-48, Gigabit Ethernet, and Fibre Channel long-reach transceiver modules. When combined with the MAX3748A limiting amplifier and the MAX3744 transimpendance amplifier, the MAX3738 forms a low-cost chipset for multirate optical transceivers.

The MAX3738 includes automatic power control, modulation compensation, and on-chip thermal compensation. These features allow the module to maintain a constant extinction ratio over lifetime and temperature. The MAX3738 meets all requirements for SFP modules with SFF-8472 Digital Diagnostics.

Operating from a single 3.3V supply, the MAX3738 laser driver has a programmable bias-current range of 1mA to 100mA and modulation-current range of up to 85mA when coupled. The device has self-biasing data inputs and consumes only 155mW of power. With edge-speed transition times of only 65ps, the MAX3738 generates only 18ps of deterministic jitter and 0.6ps of random jitter.

The MAX3738 is available in a 4mm x 4mm, 24-pin QFN package and operates over the extended temperature range from -40°C to +85°C.

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