AD8421

Data Sheet

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

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

 

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

 

Pin Connection Diagram ................................................................ 1

 

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

 

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

 

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

 

AR and BR Grades........................................................................ 3

 

ARM and BRM Grades................................................................ 5

 

Absolute Maximum Ratings............................................................ 8

 

Thermal Resistance ...................................................................... 8

 

ESD Caution.................................................................................. 8

 

Pin Configuration and Function Descriptions............................. 9

 

Typical Performance Characteristics ........................................... 10

 

Theory of Operation ...................................................................... 20

 

Architecture................................................................................. 20

 

Gain Selection............................................................................. 20

 

Reference Terminal .................................................................... 21

 

Input Voltage Range................................................................... 21

 

Layout .......................................................................................... 21

 

Input Bias Current Return Path ............................................... 22

 

Input Voltages Beyond the Supply Rails.................................. 22

 

Radio Frequency Interference (RFI)........................................ 23

 

Calculating the Noise of the Input Stage................................. 23

 

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

 

Differential Output Configuration .......................................... 25

 

Driving an ADC ......................................................................... 26

 

Outline Dimensions ....................................................................... 27

 

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

 

REVISION HISTORY

5/12—Revision 0: Initial Version