ADN2870ACPZ-RL

3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver ADN2870 Data Sheet FEATURES GENERAL DESCRIPTION SFP/SFF MSA and SFF-8472 compliant SFP reference design available 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 RoHS compliant The ADN28701 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 to be calibrated at 25°C, eliminating the expensive and time consuming temperature calibration. The ADN2870 supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate operation from 155 Mbps to 3.3 Gbps. Average power and extinction ratios can be set with reference voltages provided by a microcontroller DAC or by adjustable resistors. The ADN2870 provides bias and modulation current monitoring as well as fail alarms and automatic laser shutdown. The device interfaces easily with the ADuC702x family of MicroConverters® and with the ADN289x family of limiting amplifiers to make a complete SFP/SFF transceiver solution. An SFP reference design is available. The product is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range. 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 1 Protected by U.S. Patent 6,414,974. APPLICATIONS DIAGRAM VCC VCC VCC Tx_FAULT VCC L Tx_FAIL VCC FAIL ALS IMODN LASER R MPD IMODP DATAP PAVSET ANALOG DEVICES MICROCONTROLLER DAC VCC IBIAS CONTROL ADC RZ IBIAS RPAV 1kΩ CCBIAS GND ERREF ADN2870 1kΩ ERSET GND IBMON IMMON VCC GND PAVCAP GND 1kΩ GND ERCAP GND 470Ω GND 04510-001 DAC DATAN 100Ω IMOD PAVREF Figure 1. Application Diagram Showing Microcontroller Interface Rev. D 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 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 ©2004–2020 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADN2870 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Theory of Operation ...................................................................... 11  Applications ...................................................................................... 1  Dual-Loop Control .................................................................... 11  General Description ......................................................................... 1  Control......................................................................................... 12  Applications Diagram ...................................................................... 1  Voltage Setpoint Calibration .................................................... 12  Revision History ............................................................................... 2  Resistor Setpoint Calibration ................................................... 14  Specifications .................................................................................... 3  IMPD Monitoring .......................................................................... 14  SFP Timing Specifications .............................................................. 5  Loop Bandwidth Selection ........................................................ 15  Absolute Maximum Ratings ........................................................... 6  Power Consumption .................................................................. 15  ESD Caution.................................................................................. 6  Automatic Laser Shutdown (Tx_Disable) .............................. 15  Pin Configuration and Function Descriptions ............................ 7  Bias and Modulation Monitor Currents ................................. 15  Typical Performance Characteristics ............................................. 8  Data Inputs.................................................................................. 15  Optical Waveforms ........................................................................ 10  Laser Diode Interfacing ............................................................. 16  Multirate Performance Using Low Cost Fabry Perot Tosa NEC NX7315UA ........................................................................ 10  Alarms.......................................................................................... 17  Dual-Loop Performance Over Temperature Using DFB Tosa SUMITOMO SLT2486 .............................................................. 10  Outline Dimensions ....................................................................... 18  Ordering Guide .......................................................................... 18  REVISION HISTORY 9/2020—Rev. C to Rev. D Changed CP-24-2 to CP-24-14.................................... Throughout Changes to Figure 5.......................................................................... 7 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 11/2017—Rev. B to Rev. C Changed CP-24-14 to CP-24-2.................................... Throughout Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 8/2016—Rev. A to Rev. B Changed CP-24-2 to CP-24-14.................................... Throughout Changes to Table 4 ........................................................................... 7 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 3/2008—Rev. 0 to Rev. A Changes to Features, General Description, and Figure 1 ............1 Changes to Table 3 ............................................................................6 Changes to Figure 5 ..........................................................................7 Reorganized Layout ..........................................................................8 Changes to Modulation Control Loop Section .......................... 11 Changes to Operation with Lasers with TemperatureDependent Nonlinearity of Laser LI Curve Section .................. 12 Changes to Voltage Setpoint Calibration Section ..................... 12 Changes to Figure 26 and Figure 27 ............................................ 13 Changes to Resistor Setpoint Calibration Section and IMPD Monitoring Section ........................................................................ 14 Changes to Loop Bandwidth Selection Section ......................... 15 Changes to Laser Diode Interfacing Section, Figure 32, and Figure 33 .......................................................................................... 16 Changes to Table 5 ......................................................................... 17 Updated Outline Dimensions ...................................................... 18 Changes to Ordering Guide .......................................................... 18 8/2004—Revision 0: Initial Version Rev. D | Page 2 of 20 Data Sheet ADN2870 SPECIFICATIONS VCC = 3.0 V to 3.6 V. All specifications TMIN to TMAX, unless otherwise noted.1 Typical values as specified at 25°C. Table 1. Parameter LASER BIAS CURRENT (IBIAS) Output Current IBIAS Compliance Voltage IBIAS when ALS High CCBIAS Compliance Voltage MODULATION CURRENT (IMODP, IMODN)2 Output Current IMOD Compliance Voltage IMOD when ALS High Rise Time2, 3 Fall Time2, 3 Random Jitter2, 3 Deterministic Jitter2, 3 Pulse Width Distortion2, 3 AVERAGE POWER SET (PAVSET) Pin Capacitance Voltage Photodiode Monitor Current (Average Current) EXTINCTION RATIO SET INPUT (ERSET) Resistance Range Voltage AVERAGE POWER REFERENCE VOLTAGE INPUT (PAVREF) Voltage Range Photodiode Monitor Current (Average Current) EXTINCTION RATIO REFERENCE VOLTAGE INPUT (ERREF) Voltage Range DATA INPUTS (DATAP, DATAN)4 V p-p (Differential) Input Impedance (Single-Ended) LOGIC INPUTS (ALS) VIH VIL ALARM OUTPUT (FAIL)5 VOFF Min Max Unit 100 VCC 0.2 mA V mA V 90 VCC 0.05 104 96 1.1 35 30 mA V mA ps ps ps ps ps rms 20 mA < IMOD < 90 mA 20 mA < IMOD < 90 mA 80 1.35 1200 pF V μA Resistor setpoint mode 25 1.35 kΩ V Resistor setpoint mode Resistor setpoint mode 0.12 1 V 120 1000 μA Voltage setpoint mode (RPAV fixed at 1 kΩ) Voltage setpoint mode (RPAV fixed at 1 kΩ) 0.1 1 V Voltage setpoint mode (RERSET fixed at 1 kΩ) 2.4 V Ω ac-coupled 2 1.2 1.2 5 1.5 60 60 0.8 1.1 50 1.2 1.1 1.2 1.2 0.4 50 2 0.8 VON IBMON, IMMON DIVISION RATIO IBIAS/IBMON3 IBIAS/IBMON3 IBIAS/IBMON STABILITY3, 6 IMOD/IMMON IBMON Compliance Voltage Typ 85 92 V V >1.8 V 1.2 V Alarm if > 1.7 V Alarm if shorted to VCC (the alarm is valid for voltage setting mode only) Ignore Under Voltage or Short to GND Condition Ignore Alarm, if