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ADN2841

Part Number	ADN2841
Manufacturer	Analog Devices
Description	Dual-Loop 50 Mbps.2.7 Gbps Laser Diode Driver
Published	Mar 23, 2005
Detailed Description	Data Sheet FEATURES 50 Mbps to 2.7 Gbps operation Typical rise/fall time: 80 ps Bias current range: 2 mA to 100 mA Modul...
Datasheet	ADN2841 PDF File

Overview

Data Sheet FEATURES 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) Dual-Loop, 50 Mbps to 2.
7 Gbps Laser Diode Driver ADN2841 APPLICATIONS DWDM dual MPD wavelength fixing SONET OC-1/3/12/48 SDH STM-1/4/16 Fibre Channel Gigabit Ethernet GENERAL DESCRIPTION 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.
MPD VCC IMPD IMPD2 GND PSET GND ERSET GND IBMON IMMON IMPDMON IMPDMON2 ALS FAIL DEGRADE CLKSEL VCCx GND FUNCTIONAL BLOCK DIAGRAM VCC IMODN ERCAP GND IMOD CONTROL IBIAS PAVCAP IDTONE GND Figure 1.
ADN2841 LBWSET IMODP VCC LD DATAP DATAN CLKP CLKN IBIAS ASET GND 02659-001 Rev.
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Specifications subject to change without notice.
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