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AD7770ACPZ Datenblatt(PDF) 2 Page - Analog Devices

Teilenummer AD7770ACPZ
Bauteilbeschribung  8-Channel, 24-Bit, Simultaneous Sampling ADC
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Direct Link  http://www.analog.com
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AD7770ACPZ Datenblatt(HTML) 2 Page - Analog Devices

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AD7770
Data Sheet
Rev. A | Page 2 of 94
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
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 AD7770 ............................................................ 37
Pin Control Mode....................................................................... 37
SPI Control.................................................................................. 39
Digital SPI.................................................................................... 42
RMS Noise and Resolution............................................................ 45
High Resolution Mode............................................................... 45
Low Power Mode........................................................................ 45
Diagnostics and Monitoring ......................................................... 46
Self Diagnostics Error ................................................................ 46
Monitoring Using the AD7770 SAR ADC (SPI Control
Mode)........................................................................................... 47
Σ-Δ ADC Diagnostics (SPI Control Mode)............................ 49
Σ-Δ Output Data............................................................................. 50
ADC Conversion Output—Header and Data ........................ 50
SRC (SPI Control Mode)........................................................... 51
Data Output Interface................................................................ 52
Calculating the CRC Checksum .............................................. 57
Register Summary .......................................................................... 58
Register Details ............................................................................... 62
Channel 0 Configuration Register ........................................... 62
Channel 1 Configuration Register ........................................... 62
Channel 2 Configuration Register ........................................... 63
Channel 3 Configuration Register ........................................... 63
Channel 4 Configuration Register ........................................... 64
Channel 5 Configuration Register ........................................... 64
Channel 6 Configuration Register ........................................... 65
Channel 7 Configuration Register ........................................... 65
Disable Clocks to ADC Channel Register .............................. 66
Channel 0 Sync Offset Register ................................................ 66
Channel 1 Sync Offset Register ................................................ 66
Channel 2 Sync Offset Register ................................................ 66
Channel 3 Sync Offset Register ................................................ 67
Channel 4 Sync Offset Register ................................................ 67
Channel 5 Sync Offset Register ................................................ 67
Channel 6 Sync Offset Register ................................................ 67
Channel 7 Sync Offset Register ................................................ 67
General User Configuration 1 Register................................... 68
General User Configuration 2 Register................................... 68
General User Configuration 3 Register................................... 69
Data Output Format Register ................................................... 70
Main ADC Meter and Reference Mux Control Register ...... 71
Global Diagnostics Mux Register............................................. 71
GPIO Configuration Register................................................... 72
GPIO Data Register.................................................................... 72
Buffer Configuration 1 Register............................................... 73
Buffer Configuration 2 Register............................................... 73
Channel 0 Offset Upper Byte Register..................................... 73
Channel 0 Offset Middle Byte Register................................... 73
Channel 0 Offset Lower Byte Register..................................... 74
Channel 0 Gain Upper Byte Register....................................... 74
Channel 0 Gain Middle Byte Register ..................................... 74
Channel 0 Gain Lower Byte Register....................................... 74


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