AD7779 datasheet(2/97 Pages) AD

2 / 97 page

AD7779

Data Sheet

Rev. 0 | Page 2 of 97

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 .................................................................................... 30

RMS Noise and Resolution............................................................ 31

High Resolution Mode............................................................... 31

Low Power Mode........................................................................ 31

Theory of Operation ...................................................................... 32

Analog Inputs.............................................................................. 32

Transfer Function ....................................................................... 33

Core Signal Chain....................................................................... 34

Capacitive PGA........................................................................... 34

Internal Reference and Reference Buffers............................... 34

Integrated LDOs ......................................................................... 35

Clocking and Sampling.............................................................. 35

Digital Reset and Synchronization Pins .................................. 35

Digital Filtering........................................................................... 36

Shutdown Mode.......................................................................... 36

Controlling the AD7779............................................................ 37

Pin Control Mode....................................................................... 37

SPI Control.................................................................................. 39

Digital SPI Interface ................................................................... 42

Diagnostics and Monitoring ......................................................... 45

Self Diagnostics Error ................................................................ 45

Monitoring Using the AD7779 SAR ADC (SPI Control

Mode)........................................................................................... 46

Σ-Δ ADC Diagnostics (SPI Control Mode)............................ 48

-Δ Output Data............................................................................. 49

ADC Conversion Output—Header and Data ........................ 49

Sample Rate Converter (SRC) (SPI COntrol MOde) ............ 50

Data Output Interface................................................................ 51

Calculating the CRC Checksum .............................................. 56

Channel 0 Configuration Register ........................................... 61

Channel 1 Configuration Register ........................................... 61

Channel 2 Configuration Register ........................................... 62

Channel 3 Configuration Register ........................................... 62

Channel 4 Configuration Register ........................................... 63

Channel 5 Configuration Register ........................................... 63

Channel 6 Configuration Register ........................................... 64

Channel 7 Configuration Register ........................................... 64

Disable Clocks to ADC Channel Register .............................. 65

Channel 0 Sync Offset Register ................................................ 65

Channel 1 Sync Offset Register ................................................ 65

Channel 2 Sync Offset Register ................................................ 66

Channel 3 Sync Offset Register ................................................ 66

Channel 4 Sync Offset Register ................................................ 66

Channel 5 Sync Offset Register ................................................ 66

Channel 6 Sync Offset Register ................................................ 67

Channel 7 Sync Offset Register ................................................ 67

General User Configuration 1 Register................................... 67

General User Configuration 2 Register................................... 68

General User Configuration 3 Register................................... 69

Data Output Format Register ................................................... 69

Main ADC Meter and Reference Mux Control Register ...... 70

Global Diagnostics Mux Register............................................. 71

GPIO Configuration Register................................................... 72

GPIO Data Register.................................................................... 72

Buffer Configuration 1 Register ............................................... 72

Buffer Configuration 2 Register ............................................... 73

AD7779 数据表(PDF) 2 Page - Analog Devices

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