This document describes the features and characteristics of the 3.3 V dual-loop, 50 Mbps to 3.3 Gbps laser diode driver.
The ADN2870 is a 3.3 V dual-loop laser diode driver designed for advanced SFP and SFF modules, compliant with SFP/SFF MSA and SFF-8472 digital diagnostics. It features dual-loop control of average power and extinction ratio to automatically compensate for variations in laser characteristics over temperature and aging, eliminating the need for expensive temperature calibration. The device supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate operation from 155 Mbps to 3.3 Gbps.
| Operating Temperature Range | -40°C to +85°C |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V |
| Bias Current Range | 2 mA to 100 mA |
| Modulation Current Range | 5 mA to 90 mA |
| Rise Time | 60 ps |
| Package Type | 4 mm × 4 mm LFCSP |
The device supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate operation from 155 Mbps to 3.3 Gbps.
No, the laser only needs to be calibrated at 25°C because the device automatically compensates for variations over temperature and aging.
The FAIL output asserts when a fault occurs, causing the bias and modulation currents to turn off.