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ADN2872 Dataheets PDF



Part Number ADN2872
Manufacturers Analog Devices
Logo Analog Devices
Description 50 Mbps To 3.3 Gbps Laser Diode Driver
Datasheet ADN2872 DatasheetADN2872 Datasheet (PDF)

www.DataSheet4U.com 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver ADN2872 GENERAL DESCRIPTION Like the ADN2870, the ADN28721 laser diode driver is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio, which automatically compensates for variations in laser characteristics over temperature and aging. The laser needs only be calibrated at 25°C, eliminating the need for expensive and.

  ADN2872   ADN2872


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www.DataSheet4U.com 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver ADN2872 GENERAL DESCRIPTION Like the ADN2870, the ADN28721 laser diode driver is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio, which automatically compensates for variations in laser characteristics over temperature and aging. The laser needs only be calibrated at 25°C, eliminating the need for expensive and time consuming temperature calibration. The ADN2872 supports single-rate operation from 50 Mbps to 3.3 Gbps, or multirate operation from 155 Mbps to 3.3 Gbps. With a new alarm scheme, this device avoids the shutdown issue caused by the system transient generated from various lasers. The average power and extinction ratio can be set with a voltage provided by a microcontroller DAC or by a trimmable resistor. The part provides both bias and modulation current monitoring, as well as fail alarms and automatic laser shutdown. The ADN2872, a SFF-/SFP-compliant laser diode driver, can work with the Analog Devices, Inc., ADuC7019/ADuC702x MicroConverter® family and the ADN289x limiting amplifier family, to form a complete SFP/SFF transceiver solution. The ADN2872 is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range. Figure 1 shows an application diagram with a microcontroller interface. 1 FEATURES SFP/SFF and SFF-8472 MSA compliant SFP reference design available Any rate from 50 Mbps to 3.3 Gbps operation Dual-loop control of average power and extinction ratio Typical rise/fall time: 60 ps Bias current range: 2 mA to 100 mA Modulation current range: 5 mA to 90 mA Laser FAIL alarm and automatic laser shutdown (ALS) Bias and modulation current monitoring 3.3 V operation 4 mm × 4 mm LFCSP Voltage setpoint control Resistor setpoint control APPLICATIONS Multirate OC3 to OC48-FEC SFP/SFF modules 1×/2×/4× Fibre Channel SFP/SFF modules LX-4 modules DWDM/CWDM SFP modules 1GE SFP/SFF transceiver modules Protected by U.S. Patent 6,414,974. APPLICATIONS DIAGRAM VCC VCC Tx_FAULT Tx_FAIL VCC MPD FAIL ALS IMODN VCC VCC L R IMODP DATAP ANALOG DEVICES MICROCONTROLLER DAC ADC PAVSET IMOD PAVREF CONTROL RPAV 1kΩ GND ERREF IBIAS CCBIAS IBIAS 100Ω DATAN VCC RZ LASER DAC ADN2872 1kΩ GND VCC GND GND 1kΩ GND 470Ω GND GND 08013-001 ERSET IBMON IMMON PAVCAP ERCAP Figure 1. Rev. 0 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 parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 ©2009 Analog Devices, Inc. All rights reserved. www.DataSheet4U.com ADN2872 TABLE OF CONTENTS Features .............................................................................................. 1  Applications ....................................................................................... 1  General Description ......................................................................... 1  Applications Diagram ...................................................................... 1  Revision History ............................................................................... 2  Specifications..................................................................................... 3  SFP Timing Specifications........................................................... 4  Absolute Maximum Ratings............................................................ 5  ESD Caution .................................................................................. 5  Pin Configuration and Function Descriptions ............................. 6  Typical Performance Characteristics ............................................. 7  Optical Waveforms ........................................................................... 9  Theory of Operation ...................................................................... 10  Dual-Loop Control..................................................................... 10  Control ......................................................................................... 11  Voltage Setpoint Calibration ..................................................... 11  Resistor Setpoint Calibration .................................................... 13  IMPD Monitoring .......................................................................... 13  Loop Bandwidth Selection ........................................................ 14  Power Consumption .................................................................


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