UX2222 :SFP/SFF 155M ~2.125Gbps Laser Driver

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UX2222 :SFP/SFF 155M ~2.125Gbps Laser Driver
Posting date : Apr 24, 2008
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85-
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The UX2222 is a complete CMOS laser driver for SFP/SFF applications from 155Mbps to 2.125Gbps.It is fully compliant with the SFP MSA timing and the SFF-8472 transmit diagnostic requirements. The UX2222 consists of an automatic power control (APC) feedback loop, a reference voltage generator with temperature compensation and a safety-logic circuit. The UX2222 provides complementary output currents. The APC feature allows an optical transmitter that uses a monitor photodiode to maintain constant average optical power, despite changes in laser threshold current over temperature and lifetime. Optional temperature compensation compensates Laser Diode extinction ratio change with temperature. External resistors set the require laser current level. The UX2222 provides transmit disable control pin(TX_DISABLE), bias current monitoring, and photodiode current monitoring. The device also offers a single-point latched failure output (TX_FAULT) to indicate faults.

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