Dual-Loop, 50 Mbps to 2.7 Gbps Laser Diode Driver

The ADN2841 uses a unique control algorithm to control both the average power and extinction ratio of the laser diode (LD) after initial factory setup. Because power and extinction ratio control are fully integrated, external component count is low and PCB area is small. Programmable alarms are provided for laser fail (end of life) and laser degrade (impending fail).

The ADN2841 has circuitry for a second monitor photodiode, which enables DWDM wavelength control.

Applications

* DWDM dual MPD wavelength fixing

* SONET OC-1/3/12/48

* SDH STM-1/4/16

* Fibre Channel

* Gigabit Ethernet

* 50 Mbps to 2.7 Gbps operation

* Typical rise/fall time: 80 ps

* Bias current range: 2 mA to 100 mA

* Modulation current range: 5 mA to 80 mA

* Monitor photodiode current: 50 μA to 1200 μA

* Closed-loop control of power and extinction ratio

* Laser fail and laser degrade alarms

* Automatic laser shutdown (ALS)

* Dual MPD functionality for DWDM

* Optional clocked data

* Full current parameter monitoring

* 5 V operation

* 48-lead LFCSP

* 32-lead LFCSP (reduced functionality)