16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP Data Sheet AD7988-1/AD7988-5 FEATURES TYPICAL APPLICATION CIRCUIT 2.5V TO 5V 2.5V High performance Pseudo differential analog input range 0 V to V with V from 2.5 V to 5.0 V REF REF Throughput: 500 kSPS/100 kSPS options REF VDD VIO 1.8V TO 5V 0V TO V REF SDI Zero latency architecture IN+ SCK 3- OR 4-WIRE INTERFACE 16-bit resolution with no missing codes IN (SPI, DAISY CHAIN, CS) SDO INL: 0.6 LSB typical, 1.25 LSB maximum GND CNV Dynamic range: 92 dB, V = 5 V REF SNR: 91.5 dB at f = 10 kHz, V = 5 V IN REF Figure 1. THD: 114 dB at f = 10 kHz, V = 5 V IN REF GENERAL DESCRIPTION SINAD: 91 dB at f = 10 kHz, V = 5 V IN REF 1 Low power dissipation The AD7988-1/AD7988-5 are 16-bit, successive approximation, Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V analog-to-digital converters (ADC) that operate from a single logic interface power supply, VDD. The AD7988-1 offers a 100 kSPS throughput, AD7988-1: 400 W at 100 kSPS (VDD only) and the AD7988-5 offers a 500 kSPS throughput. They are low 700 W at 100 kSPS (total) power, 16-bit sampling ADCs with a versatile serial interface AD7988-5: 2 mW at 500 kSPS (VDD only) port. On the CNV rising edge, they sample an analog input, 3.5 mW at 500 kSPS (total) IN+, between 0 V to VREF with respect to a ground sense, IN. 70 W at 10 kSPS (total) The reference voltage, REF, is applied externally and can be set Proprietary SPI-/QSPI-/MICROWIRE-/DSP-compatible independent of the supply voltage, VDD. serial interface The SPI-compatible serial interface also features the ability to 10-lead MSOP, 10-lead 3 mm 3 mm LFCSP daisy-chain several ADCs on a single 3-wire bus using the SDI Wide operating temperature range: 40C to +125C input. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using APPLICATIONS the separate supply, VIO. Automated test equipment The AD7988-1/AD7988-5 generics are housed in a 10-lead Data acquisition systems MSOP or a 10-lead LFCSP with operation specified from 40C Medical instruments to +125C. Machine automation 1 Protected by U.S. Patent 6,703,961. Table 1. MSOP, LFCSP 16-/18-/20-Bit Precision SAR ADCs and SAR ADC-Based Module Data Acquisition Solutions Type 100 kSPS 250 kSPS 500 kSPS 1000 kSPS 2000 kSPS Module Data Acquisition Solutions Differential 1 1 1 20-Bit AD4022 AD4021 AD4020 1 1 1 1 1 18-Bit AD7989-1 AD7691 AD4011 AD4007 AD4003 1 1 AD7690 AD7982 1 1 AD7989-5 AD7984 1 1 1 1 16-Bit AD7684 AD7687 AD7688 AD4005 AD4001 1 1 AD7693 AD7915 1 AD7916 Pseudo Differential 1 1 1 18-Bit AD4010 AD4006 AD4002 1 1 1 1 1 16-Bit AD7988-1 AD7685 AD4008 AD4004 AD4000 ADAQ7980 1 1 AD7680 AD7694 AD7988-5 AD7980 ADAQ7988 1 1 AD7683 AD7686 AD7983 1 Pin for pin compatible. Rev. H 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. Tel: 781.329.4700 20122020 Analog Devices, Inc. All rights reserved. No license is granted by implication or otherwise under any patent or patent rights of Analog Technical Support www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. 10231-001AD7988-1/AD7988-5 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Connection Diagram ................................................... 16 Applications ...................................................................................... 1 Analog Inputs ............................................................................. 17 Typical Application Circuit ........................................................ 1 Driver Amplifier Choice ........................................................... 17 General Description ......................................................................... 1 Voltage Reference Input ............................................................ 18 Revision History ............................................................................... 2 Power Supply .............................................................................. 18 Specifications .................................................................................... 4 Digital Interface .......................................................................... 18 Timing Specifications .................................................................. 6 CS Mode, 3-Wire ........................................................................ 19 Absolute Maximum Ratings ........................................................... 8 CS Mode 4-Wire ......................................................................... 20 Thermal Resistance ...................................................................... 8 Chain Mode ................................................................................ 21 ESD Caution.................................................................................. 8 Applications Information ............................................................. 22 Pin Configurations and Function Descriptions ........................... 9 Interfacing to Blackfin DSP ..................................................... 22 Terminology .................................................................................... 10 Layout .......................................................................................... 22 Typical Performance Characteristics ........................................... 11 Evaluating the Performance of the AD7988-1/AD7988-5 ..... 22 Theory of Operation ...................................................................... 15 Outline Dimensions ....................................................................... 23 Circuit Information ................................................................... 15 Ordering Guide .......................................................................... 24 Converter Operation .................................................................. 15 REVISION HISTORY 8/2020Rev. G to Rev. H Added Table 5: Renumbered Sequentially .................................... 6 Changes to Figure 29 ..................................................................... 14 Changes to Features Section, Applications Section, Figure 1, and Table 1 ........................................................................................ 1 Changes to Table 9 ......................................................................... 16 Change to Endnote 3, Table 2 ......................................................... 4 Changes to Voltage Reference Input Section ............................. 17 Changes to Timing Specifications Section and Table 4 .............. 6 Changes to Figure 35 ..................................................................... 18 Deleted Table 5 and Figure 3 Renumbered Sequentially ........... 6 Changes to Figure 37 ..................................................................... 20 Changes to Table 5 ........................................................................... 8 Changes to Ordering Guide .......................................................... 23 Added Thermal Resistance Section and Table 6 Renumbered Sequentially ....................................................................................... 8 8/2014Rev. D to Rev. E Changes to Figure 30 ..................................................................... 16 Deleted QFN .................................................................. Throughout Changes to Table 9 ......................................................................... 17 Changed Typical Application Diagram Section to Typical Changes to Voltage Reference Input Section and Power Application Circuit Section ............................................................. 1 Supply Section ................................................................................. 18 Changes to Features Section ............................................................ 1 Added Patent Note, Note 1 .............................................................. 1 10/2017Rev. F to Rev. G Changes to Table 1 ............................................................................ 1 Changes to Features Section and Table 1 ...................................... 1 Changes to AC Accuracy Parameter, Table 2 ............................... 3 Moved Typical Application Circuit Section and Figure 1 .......... 3 Changed nA to A, Standby Current Parameter, Unit Column, Changes to Figure 5 .......................................................................... 9 Table 3 .................................................................................................4 Updated Outline Dimensions ....................................................... 23 Changes to Table 8 ......................................................................... 16 Changes to Ordering Guide .......................................................... 24 Changes to Power Supply Section ................................................ 17 Updated Outline Dimensions ...................................................... 22 4/2016Rev. E to Rev. F Changed AD7988-x to AD7988-1/AD7988-5 ........... Throughout 8/2013Rev. C to Rev. D Changes to Table 1 ........................................................................... 1 Changes to Features Section ............................................................ 1 Changes to Table 2 ........................................................................... 3 Changes to Table 3 ............................................................................ 4 Changes to Table 3 ........................................................................... 4 Updated Outline Dimensions ...................................................... 22 Changes to Table 4 ........................................................................... 5 Changes to Ordering Guide .......................................................... 23 Rev. H Page 2 of 24