16-Bit, 2 MSPS/1 MSPS/500 kSPS, Precision, Pseudo Differential, SAR ADCs Data Sheet AD4000/AD4004/AD4008 FEATURES GENERAL DESCRIPTION Easy Drive The AD4000/AD4004/AD4008 are high accuracy, high speed, low Greatly reduced input kickback power, 16-bit, Easy Drive, precision successive approximation Input current reduced to 0.4 A/MSPS register (SAR) analog-to-digital converters (ADCs) that operate Enhanced acquisition phase, 79% of cycle time at 1 MSPS from a single power supply, VDD. The reference voltage, V , is REF First conversion accurate, no latency or pipeline delay applied externally and can be set independent of the supply Input span compression for single-supply operation voltage. The AD4000/AD40004/AD4008 power scales linearly Fast conversion time allows low SPI clock rates with throughput. Input overvoltage clamp protection sinks up to 50 mA Easy Drive features reduce both signal chain complexity and power SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface consumption while enabling higher channel density. The reduced High performance input current, particularly in high-Z mode, coupled with a long Pseudo differential input range 0 V to VREF with VREF from 2.4 V to 5.1 V signal acquisition phase, eliminates the need for a dedicated ADC Throughput: 2 MSPS/1 MSPS/500 kSPS options driver. Easy Drive broadens the range of companion circuitry that INL: 1.0 LSB maximum is capable of driving these ADCs (see Figure 2). Guaranteed 16-bit, no missing codes Input span compression eliminates the need to provide a negative SNR: 93 dB at fIN = 1 kHz, VREF = 5 V supply to the ADC driver amplifier while preserving access to the THD: 115 dB at fIN = 1 kHz 95 dB at fIN = 100 kHz full ADC code range. The input overvoltage clamp protects the SINAD: 82 dB at fIN = 1 MHz (see Figure 17) ADC inputs against overvoltage events, minimizing disturbances Oversampled dynamic range on the reference pin and eliminating the need for external 96 dB for OSR = 2 protection diodes. 123 dB for OSR = 1024 Fast device throughput up to 2 MSPS allows users to accurately Low power capture high frequency signals and to implement oversampling Single 1.8 V supply operation with 1.71 V to 5.5 V logic techniques to alleviate the challenges associated with antialias interface 2.5 mW at 500 kSPS (VDD only) filter designs. Decreased serial peripheral interface (SPI) clock 70 W at 10 kSPS, 14 mW typical at 2 MSPS (total power) rate requirements reduce digital input and output power 10-lead packages: 3 mm 3 mm LFCSP, 3 mm 4.90 mm MSOP consumption, broadens digital host options, and simplifies the Pin compatible with AD4003/AD4007/AD4011 family task of sending data across digital isolation. The SPI-compatible Guaranteed operation: 40C to +125C serial user interface is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic by using the separate VIO logic supply. APPLICATIONS 25 Automated test equipment HIGH-Z DISABLED, 2MSPS 20 HIGH-Z ENABLED, 2MSPS Machine automation Medical equipment 15 Battery-powered equipment 10 Precision data acquisition systems 5 Instrumentation and control systems 0 FUNCTIONAL BLOCK DIAGRAM 5 2.4V TO 5.1V 1.8V 10 10F REF VDD VIO AD4000/ 15 1.8V TO 5V V REF TURBO HIGH-Z AD4004/ SDI MODE V /2 REF MODE AD4008 IN+ 0 SCK 20 3-WIRE OR 4-WIRE SERIAL 16-BIT SPI INTERFACE INTERFACE SDO SAR ADC (DAISY CHAIN, CS) 25 STATUS IN CNV SPAN BITS 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 CLAMP COMPRESSION INPUT DIFFERENTIAL VOLTAGE (V) GND Figure 2. Input Current vs. Input Differential Voltage Figure 1. 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. No Tel: 781.329.4700 20162021 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 14956-001 INPUT CURRENT (A) 14956-102AD4000/AD4004/AD4008 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Driver Amplifier Choice ........................................................... 23 Applications ....................................................................................... 1 Ease of Drive Features ............................................................... 24 Functional Block Diagram .......................................................... 1 Voltage Reference Input ............................................................ 25 General Description ......................................................................... 1 Power Supply ............................................................................... 25 Revision History ............................................................................... 2 Digital Interface .......................................................................... 25 Specif ications ..................................................................................... 5 Register Read/Write Functionality........................................... 28 Timing Specifications .................................................................. 8 Status Bits .................................................................................... 30 Absolute Maximum Ratings .......................................................... 10 CS Mode, 3-Wire Turbo Mode ................................................. 31 Thermal Resistance .................................................................... 10 CS Mode, 3-Wire Without Busy Indicator ............................. 32 ESD Caution ................................................................................ 10 CS Mode, 3-Wire with Busy Indicator .................................... 33 Pin Configurations and Function Descriptions ......................... 11 CS Mode, 4-Wire Turbo Mode ................................................. 34 Typical Performance Characteristics ........................................... 12 CS Mode, 4-Wire Without Busy Indicator ............................. 35 Terminology .................................................................................... 18 CS Mode, 4-Wire with Busy Indicator .................................... 36 Theory of Operation ...................................................................... 19 Daisy-Chain Mode ..................................................................... 37 Circuit Information .................................................................... 19 Layout Guidelines....................................................................... 38 Converter Operation .................................................................. 20 Evaluating the AD4000/AD4004/AD4008 Performance ...... 38 Transfer Functions...................................................................... 20 Outline Dimensions ....................................................................... 39 Applications Information .............................................................. 21 Ordering Guide .......................................................................... 40 Typical Application Diagrams .................................................. 21 Analog Inputs .............................................................................. 22 REVISION HISTORY 2/2021Rev. D to Rev. E Changes to Figure 44 Caption, Figure 45 Caption, Voltage Changes to Features Section, Applications Section, General Reference Input Section, and Digital Interface Section ............ 25 Changes to Register Read/Write Functionality Section and Description Section .......................................................................... 1 Changes to Specifications Section and Table 1 ............................. 5 Figure 46 .......................................................................................... 28 Changes to Timing Specifications Section .................................... 8 Changes to Figure 47 ...................................................................... 29 Added Note 1 to Table 2 Renumbered Sequentially ................... 8 Changes to Status Bit Section and Figure 49 .............................. 30 Deleted Timing Diagram Section and Figure 3 Renumbered Changes to CS Mode, 3-Wire Turbo Mode Section .................. 31 Sequentially ....................................................................................... 8 Changes to CS Mode, 3-Wire Without Busy Indicator Section ...... 32 Added Note 1 to Table 3 Renumbered Sequentially ................... 9 CS Changes to Mode, 3-Wire With Busy Indicator Section, Changes to Thermal Resistance Section ...................................... 10 Figure 54, and Figure 55 ................................................................ 33 Changes to Table 7 .......................................................................... 11 Changes to CS Mode, 4-Wire Turbo Mode Section .................. 34 Changes to Effective Number of Bits (ENOB) Section ............. 18 Changes to CS Mode, 4-Wire Without Busy Indicator Section ...... 35 Changes to Figure 7 Caption and Figure 10 Caption ................ 12 Changes to CS Mode, 4-Wire with Busy Indicator Section and Changes to Figure 11 and Figure 14 ............................................. 12 Figure 61 .......................................................................................... 36 Changes to Circuit Information Section and Table 8 ................ 19 Changes to Daisy-Chain Mode Section and Figure 62 ............. 37 Changes to Typical Application Diagrams Section .................... 21 Changes to Layout Guidelines and Evaluating the Changes to Input Overvoltage Clamp Circuit Section .............. 22 AD4000/AD4004/AD4008 Performance Section ............................. 38 Changes to Table 10, Driver Amplifier Choice Section, and Updated Outline Dimensions................................................................ 39 High Frequency Input Signals Section ........................................ 23 Changes to Ordering Guide ................................................................... 40 Changes to Multiplexed Applications Section, Input Span Compression Section, and High-Z Mode Section ..................... 24 Rev. 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