Datasheet
AD7195
Rev. 0 | Page 2 of 44
TABLE OF CONTENTS
Features .............................................................................................. 1
Interface ............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Characteristics ................................................................ 6
Absolute Maximum Ratings ............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 11
RMS Noise and Resolution ............................................................ 13
Sinc
4
Chop Disabled ................................................................... 13
Sinc
3
Chop Disabled ................................................................... 14
Sinc
4
Chop Enabled .................................................................... 15
Sinc
3
Chop Enabled .................................................................... 16
On-Chip Registers .......................................................................... 17
Communications Register ......................................................... 18
Status Register ............................................................................. 19
Mode Register ............................................................................. 19
Configuration Register .............................................................. 21
Data Register ............................................................................... 23
ID Register ................................................................................... 23
GPOCON Register ..................................................................... 23
Offset Register ............................................................................. 24
Full-Scale Register ...................................................................... 24
ADC Circuit Information .............................................................. 25
Overview ..................................................................................... 25
Analog Input Channel ............................................................... 26
PGA .............................................................................................. 26
Reference ..................................................................................... 26
Reference Detect ......................................................................... 26
Bipolar/Unipolar Configuration .............................................. 27
Data Output Coding .................................................................. 27
Burnout Currents ....................................................................... 27
AC Excitation .............................................................................. 27
Channel Sequencer .................................................................... 28
Digital Interface .......................................................................... 28
Reset ............................................................................................. 32
System Synchronization ............................................................ 32
Clock ............................................................................................ 32
Enable Parity ............................................................................... 32
Temperature Sensor ................................................................... 32
Bridge Power-Down Switch ...................................................... 33
Calibration ................................................................................... 33
Digital Filter ................................................................................ 34
Sinc
4
Filter (Chop Disabled) ..................................................... 34
Sinc
3
Filter (Chop Disabled) ..................................................... 36
Chop Enabled (Sinc
4
Filter) ...................................................... 38
Chop Enabled (Sinc
3
Filter) ...................................................... 40
Summary of Filter Options ....................................................... 41
Grounding and Layout .............................................................. 42
Applications Information .............................................................. 43
Weigh Scales ................................................................................ 43
Outline Dimensions ....................................................................... 44
Ordering Guide .......................................................................... 44
REVISION HISTORY
1/10—Revision 0: Initial Version