AD8422

Data Sheet

Rev. B | Page 2 of 27

TABLE OF CONTENTS

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

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

General Description......................................................................... 1

Typical Application Diagram.......................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

SOIC_N.......................................................................................... 3

MSOP............................................................................................. 5

LFCSP............................................................................................. 7

Absolute Maximum Ratings.......................................................... 10

Thermal Resistance.................................................................... 10

Electrostatic Discharge (ESD) Ratings .................................... 10

ESD Caution................................................................................ 10

Pin Configurations and Function Descriptions ......................... 11

Typical Performance Characteristics ........................................... 12

Theory of Operation ...................................................................... 21

Architecture ................................................................................ 21

Gain Selection............................................................................. 21

Reference Terminal .................................................................... 22

Input Voltage Range................................................................... 22

Layout .......................................................................................... 22

Input Bias Current Return Path ............................................... 23

Input Voltages Beyond the Supply Rails.................................. 23

RF Interference (RFI)................................................................. 24

Applications Information.............................................................. 25

Precision Bridge Conditioning................................................. 25

Process Control Analog Input .................................................. 25

Outline Dimensions....................................................................... 26

Ordering Guide .......................................................................... 27

REVISION HISTORY

4/2021—Rev. A to Rev. B

Added 8-Lead LFCSP.........................................................Universal

Changes to Features Section and General Description Section. 1

Deleted Connection Diagram, Figure 1; Renumbered

Sequentially ....................................................................................... 1

Added Typical Application Diagram, Figure 1; Renumbered

Sequentially ....................................................................................... 1

Changes to Table 1............................................................................ 3

Changes to Table 2............................................................................ 5

Added LFCSP Section and Table 3; Renumbered Sequentially........7

Changes to Thermal Resistance Section and Table 5 ................ 10

Added Electrostatic Discharge (ESD) Ratings Section, ESD

Ratings for AD8422 Section, and Table 6.................................... 10

Added Figure 4; Renumbered Sequentially ................................ 11

Changes to Table 7.......................................................................... 11

Changes to Figure 32...................................................................... 16

Updated Outline Dimensions....................................................... 26

Changes to Ordering Guide .......................................................... 27

1/2015—Rev. 0 to Rev. A

Changes to Features Section ............................................................1

Changes to SOIC Package Section and Table 1 .............................4

Changes to MSOP Package Section and Table 2...........................5

Changes to Supply Voltage Parameter and

ESD Parameter, Table 3.....................................................................8

Deleted Figure 12 and Figure 15, Renumbered Sequentially ... 11

Changes to Figure 10 to Figure 15................................................ 11

Changes to Figure 16, Figure 18, and Figure 19......................... 12

Changes to Figure 23 and Figure 24............................................. 13

Changes to Figure 31, Figure 32, and Figure 33......................... 14

Changes to Figure 64...................................................................... 23

5/2013—Revision 0: Initial Version