Datasheet

AD7192
Rev. A | Page 2 of 40
TABLE OF CONTENTS
Features .............................................................................................. 1
Interface ............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Characteristics ..................................................................... 7
Circuit and Timing Diagrams ..................................................... 7
Absolute Maximum Ratings ............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution .................................................................................. 9
Pin Configuration and Function Descriptions ........................... 10
Typical Performance Characteristics ........................................... 12
RMS Noise and Resolution ............................................................ 14
Sinc
4
Chop Disabled ................................................................... 14
Sinc
3
Chop Disabled ................................................................... 15
Sinc
4
Chop Enabled .................................................................... 16
Sinc
3
Chop Enabled .................................................................... 17
On-Chip Registers .......................................................................... 18
Communications Register ......................................................... 18
Status Register ............................................................................. 19
Mode Register ............................................................................. 19
Configuration Register .............................................................. 21
Data Register ............................................................................... 23
ID Register ................................................................................... 23
GPOCON Register ..................................................................... 24
Offset Register ............................................................................ 24
Full-Scale Register ...................................................................... 24
ADC Circuit Information .............................................................. 25
Overview ..................................................................................... 25
Filter, Output Data Rate, and Settling Time ........................... 25
Digital Interface .......................................................................... 28
Circuit Description......................................................................... 32
Analog Input Channel ............................................................... 32
Programmable Gain Array (PGA) ........................................... 32
Bipolar/Unipolar Configuration .............................................. 32
Data Output Coding .................................................................. 32
Clock ............................................................................................ 32
Burnout Currents ....................................................................... 33
Reference ..................................................................................... 33
Reference Detect ......................................................................... 33
Reset ............................................................................................. 34
System Synchronization ............................................................ 34
Temperature Sensor ................................................................... 34
Bridge Power-Down Switch ...................................................... 34
Logic Outputs ............................................................................. 34
Enable Parity ............................................................................... 35
Calibration ................................................................................... 35
Grounding and Layout .............................................................. 36
Applications Information .............................................................. 37
Weigh Scales ................................................................................ 37
Outline Dimensions ....................................................................... 38
Ordering Guide .......................................................................... 38
REVISION HISTORY
5/09—Rev. 0 to Rev. A
Change to Gain Error Specification ............................................... 3
Changes to Table 3 ............................................................................ 9
5/09—Revision 0: Initial Version