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AD7771 Datasheet(PDF) 3 Page - Analog Devices |
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AD7771 Datasheet(HTML) 3 Page - Analog Devices |
3 / 99 page AD7771 Data Sheet Rev. 0 | Page 2 of 98 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 3 Functional Block Diagram .............................................................. 4 Specifications..................................................................................... 5 DOUTx Timing Characterististics............................................. 9 SPI Timing Characterististics ................................................... 10 Synchronization Pins and Reset Timing Characteristics...... 11 SAR ADC Timing Characterististics ....................................... 12 GPIO SRC Update Timing Characterististics......................... 12 Absolute Maximum Ratings.......................................................... 13 Thermal Resistance .................................................................... 13 ESD Caution................................................................................ 13 Pin Configuration and Function Descriptions........................... 14 Typical Performance Characteristics ........................................... 17 Terminology .................................................................................... 32 Theory of Operation ...................................................................... 34 Analog Inputs.............................................................................. 34 Transfer Function ....................................................................... 35 Core Signal Chain....................................................................... 36 Capacitive PGA........................................................................... 36 Internal Reference and Reference Buffers............................... 36 Integrated LDOs ......................................................................... 37 Clocking and Sampling.............................................................. 37 Digital Reset and Synchronization Pins .................................. 37 Digital Filtering........................................................................... 38 Shutdown Mode.......................................................................... 38 Controlling the AD7771............................................................ 39 Pin Control Mode....................................................................... 39 SPI Control.................................................................................. 42 Digital SPI.................................................................................... 44 RMS Noise and Resolution............................................................ 47 High Resolution Mode............................................................... 47 Low Power Mode........................................................................ 48 Diagnostics and Monitoring ......................................................... 49 Self Diagnostics Error ................................................................ 49 Monitoring Using the AD7771 SAR ADC (SPI Control Mode)........................................................................................... 50 Σ-Δ ADC Diagnostics (SPI Control Mode)............................ 52 Σ-∆ Output Data............................................................................. 53 ADC Conversion Output—Header and Data ........................ 53 Sample Rate Converter (SRC) (SPI Control Mode) .............. 54 Data Output Interface................................................................ 56 Calculating the CRC Checksum .............................................. 60 Register Summary .......................................................................... 61 Register Details ............................................................................... 65 Channel 0 Configuration Register ........................................... 65 Channel 1 Configuration Register ........................................... 65 Channel 2 Configuration Register ........................................... 66 Channel 3 Configuration Register ........................................... 66 Channel 4 Configuration Register ........................................... 67 Channel 5 Configuration Register ........................................... 67 Channel 6 Configuration Register ........................................... 68 Channel 7 Configuration Register ........................................... 68 Disable Clocks to ADC Channel Register .............................. 69 Channel 0 Sync Offset Register ................................................ 69 Channel 1 Sync Offset Register ................................................ 69 Channel 2 Sync Offset Register ................................................ 69 Channel 3 Sync Offset Register ................................................ 70 Channel 4 Sync Offset Register ................................................ 70 Channel 5 Sync Offset Register ................................................ 70 Channel 6 Sync Offset Register ................................................ 70 Channel 7 Sync Offset Register ................................................ 70 General User Configuration 1 Register................................... 71 General User Configuration 2 Register................................... 72 General User Configuration 3 Register................................... 73 Data Output Format Register ................................................... 73 Main ADC Meter and Reference Mux Control Register ...... 74 Global Diagnostics Mux Register............................................. 75 GPIO Configuration Register................................................... 75 GPIO Data Register.................................................................... 76 Buffer Configuration 1 Register............................................... 76 Buffer Configuration 2 Register............................................... 76 Channel 0 Offset Upper Byte Register..................................... 77 Channel 0 Offset Middle Byte Register................................... 77 Channel 0 Offset Lower Byte Register..................................... 77 Channel 0 Gain Upper Byte Register....................................... 77 Channel 0 Gain Middle Byte Register ..................................... 77 Channel 0 Gain Lower Byte Register....................................... 78 |
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