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ADN2847 Datasheet(PDF) 1 Page - Analog Devices |
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ADN2847 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 3.3 V Dual-Loop 50 Mbps to 3.3 Gbps Laser Diode Driver Data Sheet ADN2847 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2003–2012 Analog Devices, Inc. All rights reserved. FEATURES 50 Mbps to 3.3 Gbps operation Single 3.3 V 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 Dual MPD functionality for DWDM 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 48-lead (7 mm × 7 mm) LFCSP package 32-lead (5 mm × 5 mm) LFCSP package APPLICATIONS SONET OC-1/3/12/48 SDH STM-0/1/4/16 Fibre Channel Gigabit Ethernet DWDM dual MPD wavelength control GENERAL DESCRIPTION The ADN2847 uses a unique control algorithm to control both average power and extinction ratio of the laser diode (LD) after initial factory setup. External component count and PCB area are low, as both power and extinction ratio control are fully integrated. Programmable alarms are provided for laser fail (end of life) and laser degrade (impending fail). Optional dual MPD current monitoring is designed into the ADN2847 specifically for DWDM wavelength control. The ADN2847 is specified for the −40°C to +85°C temperature range and is available in a 48-lead LFCSP package and a 32-lead LFCSP package. FUNCTIONAL BLOCK DIAGRAM CONTROL DATAP DATAN CLKP CLKN IMODP LD VCC VCC GND ASET IMOD IBIAS GND GND GND GND GND LBWSET IDTONE PAVCAP ERCAP ERSET PSET IMPD2 IMPD VCC MPD VCC ADN2847 IMODN IBIAS RZ Figure 1. |
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