Datasheet

AD7176-2 Data Sheet
Rev. A | Page 2 of 68
TABLE OF CONTENTS
Features .............................................................................................. 1
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 .............................................. 15
Getting Started ................................................................................ 16
Power Supplies ............................................................................ 17
Digital Communication ............................................................. 17
Configuration Overview ........................................................... 19
Circuit Description ......................................................................... 23
Analog Input ............................................................................... 23
Driver Amplifiers ....................................................................... 23
AD7176-2 Reference ................................................................... 26
AD7176-2 Clock Source ............................................................. 27
Digital Filters ................................................................................... 28
Sinc5 + Sinc1 Filter..................................................................... 28
Sinc3 Filter ................................................................................... 29
Single Cycle Settling ................................................................... 29
Enhanced 50 Hz and 60 Hz Rejection Filters ......................... 31
Operating Modes ............................................................................ 34
Continuous Conversion Mode ................................................. 34
Continuous Read Mode ............................................................. 35
Single Conversion Mode ........................................................... 36
Standby and Power-Down Modes ............................................ 37
Calibration Modes ...................................................................... 37
Digital Interface .............................................................................. 38
Checksum Protection................................................................. 38
CRC Calculation ......................................................................... 39
General-Purpose I/O ................................................................. 41
16-Bit/24-Bit Conversions ......................................................... 41
Serial Interface Reset (DOUT_RESET) .................................. 41
Synchronization (
SYNC
/
ERROR
) ........................................... 41
Error Flags ................................................................................... 42
DATA_STAT ............................................................................... 42
IOSTRENGTH ........................................................................... 42
Grounding and Layout .................................................................. 43
Register Summary .......................................................................... 44
Register Details ............................................................................... 46
Communications Register ......................................................... 46
Status Register ............................................................................. 47
ADC Mode Register ................................................................... 48
Interface Mode Register ............................................................ 49
Register Check ............................................................................ 50
Data Register ............................................................................... 50
GPIO Configuration Register ................................................... 51
ID Register................................................................................... 52
Channel Map Register 0 ............................................................ 53
Channel Map Register 1 ............................................................ 54
Channel Map Register 2 ............................................................ 55
Channel Map Register 3 ............................................................ 56
Setup Configuration Register 0 ................................................ 57
Setup Configuration Register 1 ................................................ 57
Setup Configuration Register 2 ................................................ 58
Setup Configuration Register 3 ................................................ 58
Filter Configuration Register 0 ................................................. 59
Filter Configuration Register 1 ................................................. 60
Filter Configuration Register 2 ................................................. 61
Filter Configuration Register 3 ................................................. 62
Offset Register 0 ......................................................................... 63
Offset Register 1 ......................................................................... 63
Offset Register 2 ......................................................................... 63
Offset Register 3 ......................................................................... 63
Gain Register 0............................................................................ 64
Gain Register 1............................................................................ 64
Gain Register 2............................................................................ 64
Gain Register 3............................................................................ 64
Outline Dimensions ....................................................................... 65
Ordering Guide .......................................................................... 65