AD7172-2
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
CRC Calculation......................................................................... 42
Integrated Functions ...................................................................... 44
General-Purpose Input/Output................................................ 44
External Multiplexer Control ................................................... 44
Delay ............................................................................................ 44
16-Bit/24-Bit Conversions......................................................... 44
DOUT_RESET ........................................................................... 44
Synchronization.......................................................................... 44
Error Flags................................................................................... 45
DATA_STAT ............................................................................... 45
IOSTRENGTH ........................................................................... 46
Internal Temperature Sensor .................................................... 46
Grounding and Layout .................................................................. 47
Register Summary .......................................................................... 48
Register Details ............................................................................... 49
Communications Register......................................................... 49
Status Register............................................................................. 50
ADC Mode Register................................................................... 51
Interface Mode Register ............................................................ 52
Register Check............................................................................ 53
Data Register............................................................................... 53
GPIO Configuration Register................................................... 54
ID Register................................................................................... 55
Channel Register 0 ..................................................................... 55
Channel Register 1 to Channel Register 3 .............................. 56
Setup Configuration Register 0 ................................................ 57
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Timing Characteristics ................................................................ 7
Timing Diagrams.......................................................................... 8
Absolute Maximum Ratings............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution.................................................................................. 9
Pin Configuration and Function Descriptions........................... 10
Typical Performance Characteristics ........................................... 12
Noise Performance and Resolution.............................................. 19
Getting Started................................................................................ 20
Power Supplies ............................................................................ 21
Digital Communication............................................................. 21
AD7172-2 Reset.......................................................................... 22
Configuration Overview ........................................................... 22
Circuit Description......................................................................... 27
Buffered Analog Input ............................................................... 27
Crosspoint Multiplexer.............................................................. 27
AD7172-2 Reference.................................................................. 28
Buffered Reference Input........................................................... 29
Clock Source ............................................................................... 29
Digital Filters................................................................................... 30
Sinc5 + Sinc1 Filter..................................................................... 30
Sinc3 Filter................................................................................... 30
Single Cycle Settling................................................................... 31
Enhanced 50 Hz and 60 Hz Rejection Filters ......................... 34
Operating Modes............................................................................ 37
Continuous Conversion Mode ................................................. 37
Continuous Read Mode............................................................. 38
Single Conversion Mode ........................................................... 39
Standby and Power-Down Modes............................................ 40
Calibration................................................................................... 40
Digital Interface .............................................................................. 41
Checksum Protection................................................................. 41
Setup Configuration Register 1 to Setup Configuration
Register 3 ..................................................................................... 57
Filter Configuration Register 0................................................. 58
Filter Configuration Register 1 to Filter Configuration
Register 3 ..................................................................................... 59
Offset Register 0 ......................................................................... 59
Offset Register 1 to Offset Register 3....................................... 59
Gain Register 0............................................................................ 59
Gain Register 1 to Gain Register 3........................................... 59
Outline Dimensions ....................................................................... 60
Ordering Guide .......................................................................... 60
Rev. A | Page 2 of 60
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