AD7172-4
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
CRC Calculation......................................................................... 40
Integrated Functions...................................................................... 42
General-Purpose Input/Output................................................ 42
External Multiplexer Control ................................................... 42
Delay ............................................................................................ 42
16-Bit/24-Bit Conversions......................................................... 42
DOUT_RESET ........................................................................... 42
Synchronization.......................................................................... 42
Error Flags................................................................................... 43
DATA_STAT ............................................................................... 43
IOSTRENGTH ........................................................................... 43
Grounding and Layout .................................................................. 44
Register Summary .......................................................................... 45
Register Details ............................................................................... 47
Communications Register......................................................... 47
Status Register............................................................................. 48
ADC Mode Register................................................................... 49
Interface Mode Register ............................................................ 50
Register Check............................................................................ 51
Data Register............................................................................... 51
GPIO Configuration Register................................................... 52
ID Register................................................................................... 53
Channel Register 0 ..................................................................... 54
Channel Register 1 to Channel Register 7 .............................. 55
Setup Configuration Register 0 ................................................ 56
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Timing Characteristics ................................................................ 7
Timing Diagrams.......................................................................... 7
Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 11
Noise Performance and Resolution.............................................. 17
Getting Started................................................................................ 18
Power Supplies ............................................................................ 19
Digital Communication............................................................. 19
AD7172-4 Reset.......................................................................... 20
Configuration Overview ........................................................... 20
Circuit Description......................................................................... 26
Buffered Analog Input ............................................................... 26
Crosspoint Multiplexer.............................................................. 26
AD7172-4 Reference.................................................................. 27
Buffered Reference Input........................................................... 28
Clock Source ............................................................................... 28
Digital Filters................................................................................... 29
Sinc5 + Sinc1 Filter..................................................................... 29
Sinc3 Filter................................................................................... 29
Single Cycle Settling................................................................... 30
Enhanced 50 Hz and 60 Hz Rejection Filters ......................... 33
Operating Modes............................................................................ 35
Continuous Conversion Mode ................................................. 35
Continuous Read Mode............................................................. 36
Single Conversion Mode ........................................................... 37
Standby and Power-Down Modes............................................ 38
Calibration................................................................................... 38
Digital Interface .............................................................................. 39
Checksum Protection................................................................. 39
Setup Configuration Register 1 to Setup Configuration
Register 7 ..................................................................................... 57
Filter Configuration Register 0................................................. 58
Filter Configuration Register 1 to Filter Configuration
Register 7 ..................................................................................... 59
Offset Register 0 ......................................................................... 59
Offset Register 1 to Offset Register 7....................................... 59
Gain Register 0............................................................................ 60
Gain Register 1 to Gain Register 7........................................... 60
Outline Dimensions....................................................................... 61
Ordering Guide .......................................................................... 61
Rev. B | Page 2 of 61
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