Datasheet

AD7796/AD7797
Rev. A | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Interface ............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Characteristics..................................................................... 5
Timing Diagrams.......................................................................... 6
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
RMS Noise and Resolution Specifications .................................... 9
Typical Performance Characteristics ........................................... 10
On-Chip Registers.......................................................................... 11
Communication Register .......................................................... 11
Status Register............................................................................. 12
Mode Register ............................................................................. 12
Configuration Register .............................................................. 14
Data Register............................................................................... 14
ID Register................................................................................... 14
Offset Register ............................................................................ 15
Full-Scale Register...................................................................... 15
ADC Circuit Information.............................................................. 16
Overview ..................................................................................... 16
Digital Interface.......................................................................... 17
Circuit Description......................................................................... 20
Analog Input Channel ............................................................... 20
Bipolar/Unipolar Configuration .............................................. 20
Data Output Coding .................................................................. 20
Reference ..................................................................................... 20
Reset ............................................................................................. 21
Burnout Currents ....................................................................... 21
AV
DD
Monitor ............................................................................. 21
Temperature Monitor ................................................................ 21
Calibration................................................................................... 21
Grounding and Layout .............................................................. 22
Applications..................................................................................... 23
Weigh Scales................................................................................ 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
8/06—Rev. 0 to Rev. A.
Changes to Table 1............................................................................ 3
Changes to Figure 5.......................................................................... 8
Changes to Table 14........................................................................ 13
7/06—Revision 0: Initial Version