AD7796/AD7797

Data Sheet

Rev. B | Page 2 of 24

TABLE OF CONTENTS

Features .............................................................................................. 1

Interface ............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description......................................................................... 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

AVDD Monitor ............................................................................. 21

Temperature Monitor ................................................................ 21

Calibration................................................................................... 21

Grounding and Layout .............................................................. 22

Applications Information .............................................................. 23

Weigh Scales................................................................................ 23

Outline Dimensions....................................................................... 24

Ordering Guide .......................................................................... 24

REVISION HISTORY

3/16—Rev. A to Rev. B

Changes to RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80

Section and Table 11....................................................................... 12

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