EVALZ-ADN2871

3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver ADN2871 Data Sheet FEATURES GENERAL DESCRIPTION SFP/SFF and SFF-8472 MSA-compliant SFP reference design available 50 Mbps to 4.25 Gbps operation Automatic average power control Typical 60 ps rise/fall time VCSEL, DFB, and FP laser support 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 supply 4 mm × 4 mm LFCSP Voltage setpoint control Resistor setpoint control Pin-compatible with ADN2870 The ADN2871 laser diode driver (LDD) is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The ADN2871 supports operation from 50 Mbps up to 4.25 Gbps. Average power and extinction ratios can be set with a voltage provided by a microcontroller DAC or by a trimmable resistor or digital potentiometer. The average power control loop is implemented using feedback from a monitor photodiode. The device provides bias and modulation current monitoring, as well as fail alarms and automatic laser shutdown (ALS). The device interfaces easily with the Analog Devices, Inc., ADuC7019 and ADuC7020 family of MicroConverter® devices and with the ADN2890, ADN2891, and ADN2892 family of limiting amplifiers to make a complete SFP/SFF transceiver solution. An SFP reference design is available. The product is pin-compatible with the ADN2870 dual-loop LDD, allowing the same design to work with either device. For dual-loop control applications, refer to the ADN2870 data sheet. The product is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range. APPLICATIONS 1×/2×/4× Fibre Channel SFP/SFF modules Multirate OC3 to OC48-FEC SFP/SFF modules LX-4 modules DWDM/CWDM SFP modules 1GE SFP/SFF transceiver modules VCSEL, DFB, and FP transmitters Figure 1 shows an application diagram of the voltage setpoint control with single-ended laser interface. Figure 36 shows a differential-ended laser interface. APPLICATIONS DIAGRAM VCC VCC VCC Tx_DISABLE VCC L Tx_FAULT VCC FAIL ALS IMODN LASER R MPD IMODP DATAP PAVSET ANALOG DEVICES MICROCONTROLLER PAVREF DAC ×100 1kΩ RZ CCBIAS IMOD GND ERREF ERSET ADN2871 1kΩ GND IBMON IMMON VCC GND PAVCAP NC GND 1kΩ GND 470Ω GND 05228-001 DAC VCC IBIAS RPAV ADC DATAN 100Ω CONTROL Figure 1. Typical Application Setup 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 ©2005–2020 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADN2871 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Theory of Operation ...................................................................... 13  Applications ...................................................................................... 1  Laser Control .............................................................................. 13  General Description ......................................................................... 1  Control Methods ........................................................................ 13  Applications Diagram ...................................................................... 1  Voltage Setpoint Calibration .................................................... 13  Revision History ............................................................................... 2  Resistor Setpoint Calibration ................................................... 15  Specifications .................................................................................... 3  IMPD Monitoring .......................................................................... 15  SFP Timing Specifications .............................................................. 5  Loop Bandwidth Selection ........................................................ 16  Absolute Maximum Ratings ........................................................... 6  Power Consumption .................................................................. 16  ESD Caution.................................................................................. 6  Automatic Laser Shutdown (Tx_Disable) .............................. 16  Pin Configuration and Function Descriptions ............................ 7  Bias and Modulation Monitor Currents ................................. 16  Typical Performance Characteristics ............................................. 8  Data Inputs.................................................................................. 17  Single-Ended Output ................................................................... 8  Laser Diode Interfacing ............................................................. 17  Differential Output ...................................................................... 9  Alarms.......................................................................................... 18  Performance Characteristics..................................................... 10  Outline Dimensions ....................................................................... 19  Optical Waveforms ........................................................................ 12  Ordering Guide .......................................................................... 19  REVISION HISTORY 10/2017—Rev. B to Rev. C Changes to Figure 6.......................................................................... 7 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 Changes to Resistor Setpoint Calibration Section, Power-On Sequence in Resistor Setpoint Mode Section, IMPD Monitoring Section, Voltage Setpoint Section, and Method 2: Measuring IMPD Across a Sense Resistor Section ................................................. 15 Changes to Loop Bandwidth Selection Section, Power Consumption Section, and Bias and Modulation Monitor Currents Section ..................................................................................... 16 Changes to Laser Diode Interfacing Section ................................... 17 Updated Outline Dimensions ...................................................... 19 Changes to Ordering Guide .......................................................... 19 1/2017—Rev. A to Rev. B Changes to Features Section, General Description Section, and Figure 1 Caption ................................................................................ 1 Added Applications Diagram Section ................................................... 1 Changes to Input Voltage Swing (Differential) Parameter, Table 1 ......................................................................................................... 3 Change to ICC Parameter, Table 1 .......................................................... 4 Changes to Table 2 .................................................................................... 5 Deleted LFCSP Parameter, Table 3 ........................................................ 6 Changes to Figure 6 and Table 4 ............................................................ 7 Moved Optical Waveforms Section ............................................. 12 Changes to Voltage Setpoint Calibration Section and Power-On Sequence in Voltage Setpoint Mode Section ............ 13 2/2007—Rev. 0 to Rev. A Changes to Figure 1 ..........................................................................1 Changes to Table 3 ............................................................................6 Changes to Table 4 ............................................................................7 Changes to Figure 29 and Figure 30 ............................................ 14 Changes to Resistor Setpoint Calibration Section, Figure 32, and Figure 33 .................................................................................. 15 Inserted Power-On Sequence in Resistor Setpoint Mode Section .................................................................................. 15 Changes to Loop Bandwidth Selection Section ......................... 16 Changes to Laser Diode Interfacing Section, Figure 35, and Figure 36 .......................................................................................... 17 Changes to Table 6 ......................................................................... 18 9/2020—Rev. C to Rev. D Changed CP-24-2 to CP-24-14.................................... Throughout Changes to Figure 6.......................................................................... 7 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 6/2005—Revision 0: Initial Version Rev. D | Page 2 of 19 Data Sheet ADN2871 SPECIFICATIONS VCC = 3.0 V to 3.6 V. All specifications TMIN to TMAX1, unless otherwise noted. Typical values as specified at 25°C. Table 1. Parameter LASER BIAS CURRENT (IBIAS) Output Current (IBIAS) Compliance Voltage IBIAS when ALS is High MODULATION CURRENT (IMODP, IMODN)2 Output Current (IMOD) Compliance Voltage IMOD when ALS is High Rise Time, Single-Ended Output2, 3 Fall Time, Single-Ended Output2, 3 Random Jitter, Single-Ended Output2, 3 Deterministic Jitter, Single-Ended Output3, 4 Pulse-Width Distortion, Single-Ended Output2, 3 Rise Time, Differential Output3, 5 Fall Time, Differential Output3, 5 Random Jitter, Differential Output3, 5 Deterministic Jitter, Differential Output3, 6 Pulse-Width Distortion, Differential Output3, 5 Rise Time, Differential Output3, 5 Fall Time, Differential Output3, 5 Random Jitter, Differential Output3, 5 Deterministic Jitter, Differential Output3, 7 Pulse-Width Distortion, Differential Output3, 5 AVERAGE POWER SET (PAVSET) Pin Capacitance Voltage Photodiode Monitor Current (Average Current) EXTINCTION RATIO SET INPUT (ERSET) Resistance Range AVERAGE POWER REFERENCE VOLTAGE INPUT (PAVREF) Voltage Range Photodiode Monitor Current (Average Current) EXTINCTION RATIO REFERENCE VOLTAGE INPUT (ERREF) Voltage Range ERREF Voltage to IMOD Gain DATA INPUTS (DATAP, DATAN)8 Input Voltage Swing (Differential) Input Impedance (Single-Ended) LOGIC INPUTS (ALS) VIH VIL Min Typ Max Unit 2 1.2 100 VCC 0.1 mA V mA 5 1.5 90 VCC 0.1 104 96 1.1 35 30 mA V mA ps ps ps (rms) ps ps ps ps ps (rms) ps ps ps ps ps (rms) ps ps 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 20 mA < IMOD < 90 mA 20 mA < IMOD < 90 mA 5 mA < IMOD < 30 mA 5 mA < IMOD < 30 mA 5 mA < IMOD < 30 mA 5 mA < IMOD < 30 mA 5 mA < IMOD < 30 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 5 mA < IMOD < 90 mA 80 1.3 1200 pF V μA Resistor setpoint mode 25 1.01 kΩ kΩ Resistor setpoint mode Voltage setpoint mode 0.07 1 V 70 1000 μA Voltage setpoint mode (RPAV fixed at 1 kΩ) Voltage setpoint mode (RPAV fixed at 1 kΩ) 0.05 0.9 V 60 60 0.8 19 21 47.1 46 0.64 12 2.1 56 55 0.61 17 1.6 1.1 50 1.5 0.99 1.2 1 100 0.4 Voltage setpoint mode (RERSET fixed at 1 kΩ) mA/V 2.4 50 2 0.8 Rev. D | Page 3 of 19 Test Conditions/Comments V p-p Ω V V AC-coupled ADN2871 Data Sheet Parameter ALARM OUTPUT (FAIL)9 VOFF Min Typ VON IBMON/IMMON DIVISION RATIO IBIAS/IBMON3 IBIAS/IBMON3 IBIAS/IBMON3 IBIAS/IBMON Stability3, 10 IMOD/IMMON IBMON Compliance Voltage SUPPLY ICC11 VCC (with Respect to GND)12 76 85 92 Unit Test Conditions/Comments >1.8 V 1.2 V typical (±10% tolerance) Alarm if > threshold (typical threshold: 1.5 V to 2.1 V) Alarm if shorted to VCC (the alarm is valid for voltage setting mode only) Undervoltage or Short to GND Condition Ignore Alarm, if < threshold (typical threshold: 0.6 V to 1.1 V) Ignore Ignore Alarm, if shorted to GND Table 6. ADN2871 Response to Various Single-Point Faults in AC-Coupled Configuration (as shown in Figure 35) Pin CCBIAS PAVSET PAVREF Short to VCC Fault state occurs Fault state occurs Voltage mode: Fault state occurs Resistor mode: Tied to VCC Short to GND Fault state occurs Fault state occurs Fault state occurs RPAV Voltage mode: Fault state occurs Resistor mode: Tied to VCC Fault state occurs PAVCAP DATAP DATAN ALS ERSET IMMON ERREF Fault state occurs Does not increase laser average power Does not increase laser average power Output currents shut off Does not increase laser average power Does not affect laser power Voltage mode: Fault state occurs IBMON FAIL IMODP IMODN IBIAS Resistor mode: Tied to VCC Fault state occurs Fault state occurs Does not increase laser average power Does not increase laser average power Fault state occurs Fault state occurs Does not increase laser average power Does not increase laser average power Normal currents Does not increase laser average power Does not increase laser average power Voltage mode: Does not increase average power Resistor mode: Fault state occurs Does not increase laser average power Does not increase laser average power Does not increase laser average power Does not increase laser average power Fault state occurs Rev. D | Page 18 of 19 Open Does not increase laser average power Fault state occurs Fault state occurs Circuit designed to tie to VCC in resistor setting mode, so no open case Voltage mode: Fault state occurs Resistor mode: Does not increase average power Fault state occurs Does not increase laser average power Does not increase laser average power Output currents shut off Does not increase laser average power Does not increase laser average power Does not increase laser average power Does not increase laser average power Does not increase laser average power Does not increase laser average power Does not increase laser power Fault state occurs Data Sheet ADN2871 OUTLINE DIMENSIONS DETAIL A (JEDEC 95) 4.10 4.00 SQ 3.90 1 0.50 BSC 2.44 2.30 SQ 2.16 EXPOSED PAD 13 TOP VIEW 0.80 0.75 0.70 SIDE VIEW PKG-003994/5111 SEATING PLANE 0.50 0.40 0.30 P IN 1 IN D IC ATO R AR E A OP T IO N S (SEE DETAIL A) 24 19 18 6 12 7 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.203 REF 0.20 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. COMPLIANT TO JEDEC STANDARDS MO-220-WGGD-8 09-07-2018-B PIN 1 INDICATOR AREA 0.30 0.25 0.20 Figure 38. 24-Lead Lead Frame Chip Scale Package [LFCSP] 4 mm × 4 mm Body and 0.75 mm Package Height (CP-24-14) Dimensions shown in millimeters ORDERING GUIDE Model1 ADN2871ACPZ ADN2871ACPZ-RL7 1 Temperature Range −40°C to +85°C −40°C to +85°C Package Description 24-Lead Lead Frame Chip Scale Package [LFCSP] 24-Lead Lead Frame Chip Scale Package [LFCSP] Z = RoHS Compliant Part. ©2005–2020 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05228-9/20(D) Rev. D | Page 19 of 19 Package Option CP-24-14 CP-24-14