18-Bit, 1 MSPS PulSAR ADC in MSOP/LFCSP Data Sheet AD7982 FEATURES FUNCTIONAL BLOCK DIAGRAM 2.5V TO 5V 2.5V High performance True differential analog input range: V REF 0 V to V with V between 2.5 V to 5 V REF REF Easy to drive with the ADA4941-1 or ADA4940-1 VIO 1.8V TO 5V REF VDD IN+ SDI Throughput: 1 MSPS 3- OR 4-WIRE SCK AD7982 INTERFACE Zero latency architecture 10V, 5V, .. SDO (SPI, CS IN DAISY CHAIN) 18-bit resolution with no missing codes GND CNV ADA4940-1/ ADA4941-1 INL: 1 LSB typical, 2 LSB maximum Dynamic range: 99 dB, V = 5 V REF Figure 1. SNR: 98 dB at f = 1 kHz, V = 5 V IN REF GENERAL DESCRIPTION THD: 119 dB at f = 1 kHz, V = 5 V IN REF SINAD: 97 dB at f = 1 kHz, V = 5 V The AD7982 is an 18-bit, successive approximation, analog-to- IN REF Low power dissipation digital converter (ADC) that operates from a single power supply, Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and VDD. The AD7982 contains a low power, high speed, 18-bit 5 V logic interface sampling ADC and a versatile serial interface port. On the CNV 4 mW at 1 MSPS (VDD only) rising edge, the AD7982 samples the voltage difference between 7 mW at 1 MSPS (total) the IN+ and IN pins. The voltages on these pins usually swing 70 W at 10 kSPS in opposite phases between 0 V and VREF. The reference voltage, Proprietary serial interface V , is applied externally and can be set independent of the REF 1 SPI-/QSPI/ MICROWIRE-/DSP-compatible supply voltage, VDD. Its power scales linearly with throughput. Ability to daisy-chain multiple ADCs and busy indicator The serial peripheral interface (SPI)-compatible serial interface 10-lead MSOP and 3 mm 3 mm 10-lead LFCSP also features the ability, using the SDI input, to daisy-chain Wide operating temperature range: 40C to +85C several ADCs on a single 3-wire bus and provides an optional busy indicator. The AD7982 is compatible with 1.8 V, 2.5 V, 3 V, APPLICATIONS and 5 V logic, using the separate VIO supply. Automated test equipment Data acquisition systems The AD7982 is available in a 10-lead MSOP or a 10-lead LFCSP Medical instruments with operation specified from 40C to +85C. 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. E 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 20072020 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. 06513-001AD7982 Data Sheet TABLE OF CONTENTS Driver Amplifier Choice ........................................................... 16 Features .............................................................................................. 1 Applications ...................................................................................... 1 Single-Ended to Differential Driver ........................................ 17 Functional Block Diagram .............................................................. 1 Voltage Reference Input ............................................................ 17 General Description ......................................................................... 1 Power Supply .............................................................................. 17 Revision History ............................................................................... 2 Digital Interface .......................................................................... 18 Specifications .................................................................................... 4 CS Mode, 3-Wire Without Busy Indicator............................. 19 Timing Specifications .................................................................. 6 CS Mode, 3-Wire with Busy Indicator .................................... 20 Absolute Maximum Ratings ........................................................... 8 CS Mode, 4-Wire Without Busy Indicator............................. 21 ESD Caution.................................................................................. 8 CS Mode, 4-Wire with Busy Indicator .................................... 22 Pin Configurations and Function Descriptions ........................... 9 Chain Mode Without Busy Indicator ..................................... 23 Typical Performance Characteristics ........................................... 10 Chain Mode with Busy Indicator ............................................. 24 Terminology .................................................................................... 13 Applications Information ............................................................. 25 Theory of Operation ...................................................................... 14 Layout .......................................................................................... 25 Circuit Information ................................................................... 14 Evaluating the Performance of the AD7982 ........................... 25 Converter Operation .................................................................. 14 Outline Dimensions ....................................................................... 26 Typical Connection Diagram ................................................... 15 Ordering Guide .......................................................................... 26 Analog Inputs ............................................................................. 16 REVISION HISTORY Added Table 5 Renumbered Sequentially .................................... 6 8/2020Rev. D to Rev. E Changes to Features Section, Applications Section, General Changes to Figure 5 and Table 7 ..................................................... 8 Description Section, and Table 1 ................................................... 1 Moved Typical Performance Characteristics Section .................. 9 Changes to Table 2 ........................................................................... 4 Changes to Figure 9 .......................................................................... 9 Changes to Timing Specifications Section and Table 4 .............. 6 Changes to Figure 23 ..................................................................... 14 Changes to Endnote 1, Table 5 ....................................................... 7 Changes to Analog Inputs Section and Table 9 ......................... 15 Added Endnote 2, Table 5 ............................................................... 7 Change to Single-Ended to Differential Driver Section Title .. 16 Deleted Figure 3 Renumbered Sequentially ................................ 7 Changes to Power Supply Section ................................................ 16 Changes to Figure 30 ..................................................................... 18 Changes to Table 6 ........................................................................... 8 Added Thermal Resistance Section and Table 7 Renumbered Changes to Figure 32 ..................................................................... 19 Sequentially ....................................................................................... 8 Changes to Figure 34 ..................................................................... 20 Changes to Figure 22 ..................................................................... 15 Changes to Figure 36 ..................................................................... 21 Changes to Driver Amplifier Choice Section and Table 10 ..... 16 Changes to Chain Mode with Busy Indicator ............................ 23 Changes to Voltage Reference Input Section and Power Changes to Applications Information Section ........................... 24 Supply Section ................................................................................. 17 Changes to Ordering Guide .......................................................... 25 6/2014Rev. B to Rev. C 1/2017Rev. C to Rev. D Deleted QFN .................................................................. Throughout Added Patent Footnote .................................................................... 1 Changes to Features Section, Figure 1, and Table 1 .................... 1 7/2013Rev. A to Rev. B Changed to VIO = 2.3 V to 5.5 V to VIO = 1.71 V to 5.5 V ...... 3 Added Low Power Dissipation of 4 mW at 1 MSPS (VDD only) Changes to Table 2 ........................................................................... 3 to Features Section ............................................................................ 1 Deleted VIO Range Parameter, Table 3 ........................................ 4 Changes to Power Dissipation Table 3 .......................................... 4 Changed to VIO = 2.3 V to 5.5 V to VIO = 1.71 V to 5.5 V ...... 4 Added EPAD Notation to Figure 5 and Table 6 ........................... 7 Changes to VIO Parameter, Table 3 .............................................. 4 Updated Outline Dimensions ...................................................... 24 Changes to Ordering Guide .......................................................... 24 Changes to Table 4 ........................................................................... 5 Rev. E Page 2 of 26