The ADN2870ACPZ is a dual-loop Laser Diode Driver designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio, which automatically compensates for variations in laser characteristics over-temperature and aging. The laser needs only to be calibrated at 25°C, eliminating the expensive and time consuming temperature calibration. The ADN2870 supports single-rate operation from 50Mbps to 3.3Gbps or multirate operation from 155Mbps to 3.3Gbps. Average power and extinction ratios can be set with reference voltages provided by a microcontroller DAC or by adjustable resistors. The ADN2870 provides bias and modulation current monitoring as well as fail alarms and automatic laser shutdown. The device interfaces easily with the ADuC702x family of MicroConverters® and with the ADN289x family of limiting amplifiers to make a complete SFP/SFF transceiver solution.
Dual-loop control of average power and extinction ratio
