Datasheet AD7731 (Analog Devices) - 2

AD7731* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS REFERENCE MATERIALS
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Technical Articles
• Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
EVALUATION KITS
• MS-2210: Designing Power Supplies for High Speed ADC • AD7731 Evaluation Kit • Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs
DOCUMENTATION
• Part 2: Circuit Suggestions Using Features and
Application Notes
Functionality of New Sigma-Delta ADCs • AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change
DESIGN RESOURCES
• AN-283: Sigma-Delta ADCs and DACs • AD7731 Material Declaration • AN-311: How to Reliably Protect CMOS Circuits Against • PCN-PDN Information Power Supply Overvoltaging • Quality And Reliability • AN-388: Using Sigma-Delta Converters-Part 1 • Symbols and Footprints • AN-389: Using Sigma-Delta Converters-Part 2 • AN-397: Electrically Induced Damage to Standard Linear
DISCUSSIONS
Integrated Circuits: View all AD7731 EngineerZone Discussions. • AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma- Delta ADC
SAMPLE AND BUY
• AN-615: Peak-to-Peak Resolution Versus Effective Visit the product page to see pricing options. Resolution
Data Sheet TECHNICAL SUPPORT
• AD7731: Low Noise, High Throughput 24-Bit Sigma-Delta ADC Data Sheet Submit a technical question or find your regional support number.
TOOLS AND SIMULATIONS DOCUMENT FEEDBACK
• AD7730/AD7730L/AD7731 Digital Filter Model Submit feedback for this data sheet. • dt_Register_Assistant • Sigma-Delta ADC Tutorial
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM AD7731-SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Ordering Guide ESD Caution PIN CONFIGURATION Pin Function Descriptions TERMINOLOGY OUTPUT NOISE AND RESOLUTION SPECIFICATION Output Noise (CHP = 0, SKIP= 1) Output Noise (CHP = 1, SKIP = 0) ON-CHIP REGISTERS Communications Register (RS2-RS0 = 0, 0, 0) Status Register (RS2-RS0 = 0, 0, 0); Power-On/Reset Status: CX Hex Data Register (RS2-RS0 = 0, 0, 1); Power On/Reset Status: 000000 Hex Mode Register (RS2-RS0 = 0, 1, 0); Power-On/Reset Status: 0174 Hex Filter Register (RS2-RS0 = 0, 1, 1); Power-On/Reset Status: 2002 Hex Offset Calibration Register (RS2-RS0 = 1, 0, 1) Gain Calibration Register (RS2-RS0 = 1, 1, 0) Test Register (RS2-RS0 = 1, 1, 1); Power On/Reset Status: 000000 Hex READING FROM AND WRITING TO THE ON-CHIP REGISTERS CALIBRATION OPERATION SUMMARY CIRCUIT DESCRIPTION ANALOG INPUT Analog Input Channels Buffered Inputs Analog Input Ranges Programmable Gain Amplifier Bipolar/Unipolar Inputs Burnout Currents REFERENCE INPUT Reference Detect SIGMA-DELTA MODULATOR DIGITAL FILTERING Filter Architecture First State Filter/SKIP Mode Enabled (SKIP =1) Nonchop Mode (SKIP =1, CHP = 0) Chop Mode (SKIP = 1, CHP =1) Second Stage Filter Normal FIR Operation (SKIP = 0) Chop Mode (SKIP = 0, CHP =1) Nonchop Mode (SKIP = 1, CHP = 0) FASTStep Mode (SKIP = 0, FAST = 1) CALIBRATION Internal Zero-Scale Calibration Internal Full-Scale Calibration System Zero-Scale Calibration System Full-Scale Calibration Span and Offset Limits Power-Up and Calibration Drift Considerations USING THE AD7731 Clocking and Oscillator Circuit System Synchronization Single-Shot Conversions Reset Input Standby Mode Digital Outputs POWER SUPPLIES Grounding and Layout Evaluting the AD7731 Performance SERIAL INTERFACE Write Operation Read Operation CONFIGURING THE AD7731 MICROCOMPUTER/MICROPROCESSOR INTERFACING AD7731 to 68HC11 Interface AD7731 to 8051 Interface AD7731 to ADSP-2103/ADSP-2105 Interface APPLICATIONS Data Acquisition Programmable Logic Controllers Pressure Measurement Temperature Measurement Bipolar Input Signals PAGE INDEX TABLE INDEX OUTLINE DIMENSIONS