Datasheet AD7172-4 (Analog Devices) - 2

AD7172-4* PRODUCT PAGE QUICK LINKS Last Content Update: 04/21/2017 COMPARABLE PARTS REFERENCE MATERIALS
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Technical Articles
• Flexible Bandwidth 4 mA to 20 mA Current Input with
EVALUATION KITS
Easy HART Compatibility • AD7172-4 Evaluation Board
Tutorials
• MT-022: ADC Architectures III: Sigma-Delta ADC Basics
DOCUMENTATION
• MT-023: ADC Architectures IV: Sigma-Delta ADC
Data Sheet
Advanced Concepts and Applications • AD7172-4: Low Power, 24-Bit, 31.25 kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers Data Sheet
DESIGN RESOURCES Technical Books
• AD7172-4 Material Declaration • The Data Conversion Handbook, 2005 • PCN-PDN Information
User Guides
• Quality And Reliability • UG-763: Evaluating the AD7172-4 Low Power 24-Bit, 31.25 • Symbols and Footprints kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers
DISCUSSIONS SOFTWARE AND SYSTEMS REQUIREMENTS
View all AD7172-4 EngineerZone Discussions. • AD717x Microcontroller No-OS • AD717x Eval+ Software
SAMPLE AND BUY
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TOOLS AND SIMULATIONS
• AD7172 Digital Filter Frequency Response Model
TECHNICAL SUPPORT
• AD7172-4 IBIS Model Submit a technical question or find your regional support number.
REFERENCE DESIGNS
• CN0292
DOCUMENT FEEDBACK
• CN0364 Submit feedback for this data sheet.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS NOISE PERFORMANCE AND RESOLUTION GETTING STARTED POWER SUPPLIES Recommended Linear Regulators DIGITAL COMMUNICATION Accessing the ADC Register Map AD7172-4 RESET CONFIGURATION OVERVIEW Channel Configuration Channel Registers ADC Setups Setup Configuration Registers Filter Configuration Registers Gain Registers Offset Registers ADC Mode and Interface Mode Configuration ADC Mode Register Interface Mode Register Understanding Configuration Flexibility CIRCUIT DESCRIPTION BUFFERED ANALOG INPUT CROSSPOINT MULTIPLEXER Fully Differential Inputs Single-Ended Inputs AD7172-4 REFERENCE BUFFERED REFERENCE INPUT CLOCK SOURCE Internal Oscillator External Crystal External Clock DIGITAL FILTERS SINC5 + SINC1 FILTER SINC3 FILTER SINGLE CYCLE SETTLING ENHANCED 50 Hz AND 60 Hz REJECTION FILTERS OPERATING MODES CONTINUOUS CONVERSION MODE CONTINUOUS READ MODE SINGLE CONVERSION MODE STANDBY AND POWER-DOWN MODES CALIBRATION DIGITAL INTERFACE CHECKSUM PROTECTION CRC CALCULATION Polynomial Example of a Polynomial CRC Calculation—24-Bit Word: 0x654321 (8-Bit Command and 16-Bit Data) XOR Calculation Example of an XOR Calculation—24-Bit Word: 0x654321 (8-Bit Command and 16-Bit Data) INTEGRATED FUNCTIONS GENERAL-PURPOSE INPUT/OUTPUT EXTERNAL MULTIPLEXER CONTROL DELAY 16-BIT/24-BIT CONVERSIONS DOUT_RESET SYNCHRONIZATION Normal Synchronization Alternate Synchronization ERROR FLAGS ADC_ERROR CRC_ERROR REG_ERROR Input/Output DATA_STAT IOSTRENGTH GROUNDING AND LAYOUT REGISTER SUMMARY REGISTER DETAILS COMMUNICATIONS REGISTER STATUS REGISTER ADC MODE REGISTER INTERFACE MODE REGISTER REGISTER CHECK DATA REGISTER GPIO CONFIGURATION REGISTER ID REGISTER CHANNEL REGISTER 0 CHANNEL REGISTER 1 TO CHANNEL REGISTER 7 SETUP CONFIGURATION REGISTER 0 SETUP CONFIGURATION REGISTER 1 TO SETUP CONFIGURATION REGISTER 7 FILTER CONFIGURATION REGISTER 0 FILTER CONFIGURATION REGISTER 1 TO FILTER CONFIGURATION REGISTER 7 OFFSET REGISTER 0 OFFSET REGISTER 1 TO OFFSET REGISTER 7 GAIN REGISTER 0 GAIN REGISTER 1 TO GAIN REGISTER 7 OUTLINE DIMENSIONS ORDERING GUIDE