ADN2870

The ADN2870 laser diode driver is designed for advanced SFPand SFF modules, using SFF-8472 digital diagnostics. The devicefeatures dual-loop control of the average power and extinction ratio, which automatically compensates for variations in laser characteristics over temperature and aging. The laser need only be calibrated at 25°C, eliminating the need for expensive and time consuming temperature calibration. The ADN2870 supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate from 155 Mbps to 3.3 Gbps.

Average power and extinction ratio can be set with a voltage provided by a microcontroller DAC or by a trimmable resistor.The part provides bias and modulation current monitoring as well as fail alarms and automatic laser shutdown. The deviceinterfaces easily with the ADI ADuC70xx family of micro-converters and with the ADN289x family of limiting amplifiers to make a complete SFP/SFF transceiver solution. An SFPreference design is available. ADN2870 is available in a spacesaving 4 mm ×4 mm LFCSP package specified over the −40°C to +85°C temperature range.