Datasheet

AD7191
Rev. A | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Interface ............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Characteristics ................................................................ 6
Timing Diagram ........................................................................... 6
Absolute Maximum Ratings ............................................................ 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ........................................... 10
RMS Noise and Resolution Specifications .................................. 13
ADC Circuit Information .............................................................. 14
Overview ...................................................................................... 14
Filter, Data Rate, and Settling Time ......................................... 14
Gain .............................................................................................. 15
Analog Input Channels .............................................................. 15
Temperature Sensor ................................................................... 16
Power-Down (PDOWN) ........................................................... 16
Clock ............................................................................................ 16
Bipolar Configuration ................................................................ 16
Data Output Coding .................................................................. 16
Bridge Power-Down Switch ...................................................... 16
Reference ..................................................................................... 16
Digital Interface .......................................................................... 17
Grounding and Layout .............................................................. 17
Applications Information .............................................................. 19
Weigh Scales ................................................................................ 19
EMI Recommendations ............................................................. 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
REVISION HISTORY
5/09—Rev. 0 to Rev A
Changes to Gain Error Specification, Normal Mode
Rejection Specification..................................................................... 3
Changes to Table 3 ............................................................................ 7
5/09—Revision 0: Initial Version