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General Description

The DS1862A is a closed-loop laser-driver control IC with built-in digital diagnostics designed for XFP MSA. The laser control function incorporates automatic power control (APC) and allows extinction ratio control though a temperature-indexed lookup table (LUT). The DS1862A monitors up to seven analog inputs, including temperature and monitor diode (MD) current, which are used to regulate the laser bias current and extinction ratio.

Features

? Implements XFP MSA Requirements for Digital Diagnostics, Serial ID, and User Memory

? I2C-Compatible Serial Interface

? Automatic Power Control (APC)

? Extinction Ratio Control with Lookup Table

? Seven Monitored Channels for Digital Diagnostics (Five Basic Plus Two Auxiliary)

? Internal Calibration of Monitored Channels (Temp, VCC2/3, Bias Current, Transmitted, and Received Power)

? Programmable Quick-Trip Logic for Turning Off Laser for Eye Safety

? Access to Monitoring and ID Information

? Programmable Alarm and Warning Thresholds

? Operates from 3.3V or 5V Supply

? 25-Ball CSBGA, 5mm x 5mm Package

? Internal or External Temperature Sensor

? -40°C to +100°C Operating Temperature Range

? One 8-Bit Buffered DAC

Applications

??? Laser Control and Monitoring 10Gbps Optical Transceiver Modules (XFP)

??? Laser Control and Monitoring

??? Digital Diagnostics in Optical Transmission