ADN2848

Data Sheet 3.3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver ADN2848 FEATURES 50 Mbps to 1.25 Gbps operation Single 3.3 V operation Bias current range: 2 to 100 mA Modulation current range: 5 to 80 mA Monitor photo diode current: 50 μA to 1200 μA 50 mA supply current at 3.3 V Closed-loop control of power and extinction ratio Full current parameter monitoring Laser fail and laser degrade alarms Automatic laser shutdown (ALS) Optional clocked data Supports FEC rates 32-lead, 5 mm × 5 mm LFCSP_VQ package GENERAL DESCRIPTION The ADN2848 uses a unique control algorithm to control both the average power and the extinction ratio of the laser diode (LD) after initial factory setup. External component count and PCB area are low because both power and extinction ratio control are fully integrated. Programmable alarms are provided for laser fail (end of life) and laser degrade (impending fail). APPLICATIONS SONET OC-1/3/12/24 SDH STM-0/1/4 Fibre Channel Gigabit Ethernet MPD VCC IMPD PSET GND ERSET GND IBMON IMMON IMPDMON ALS FAIL DEGRADE CLKSEL VCC GND FUNCTIONAL BLOCK DIAGRAM VCC IMODN IMODP VCC LD IMOD CONTROL IBIAS ERCAP DATAP DATAN CLKP CLKN IBIAS ADN2848 ASET PAVCAP LBWSET GND VCC RZ GND GND Figure 1. 02746-001 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third part...