AD8231

Data Sheet

Rev. C | Page 2 of 24

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

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

 

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

 

Absolute Maximum Ratings............................................................ 7

 

Thermal Resistance ...................................................................... 7

 

Maximum Power Dissipation ..................................................... 7

 

ESD Caution.................................................................................. 7

 

Pin Configuration and Function Descriptions............................. 8

 

Typical Performance Characteristics ............................................. 9

 

Instrumentation Amplifier Performance Curves..................... 9

 

Operational Amplifier Performance Curves .......................... 15

 

Performance Curves Valid for Both Amplifiers ..................... 17

 

Theory of Operation ...................................................................... 18

 

Amplifier Architecture .............................................................. 18

 

Gain Selection............................................................................. 18

 

Reference Terminal .................................................................... 18

 

Layout .......................................................................................... 19

 

Input Bias Current Return Path ............................................... 19

 

Input Protection ......................................................................... 19

 

RF Interference ........................................................................... 20

 

Common-Mode Input Voltage Range ..................................... 20

 

Reducing Noise........................................................................... 20

 

Applications Information .............................................................. 21

 

Differential Output .................................................................... 21

 

Multiplexing................................................................................ 21

 

Using the AD8231 with Bipolar Supplies................................ 21

 

Sallen Key Filter.......................................................................... 22

 

Outline Dimensions ....................................................................... 23

 

Ordering Guide .......................................................................... 23

 

Automotive Products ................................................................. 23

 

REVISION HISTORY

12/14—Rev. B to Rev. C

Changes to Figure 12 to Figure 14 Captions ............................... 10

Changes to Figure 19 and Figure 20............................................. 11

Updated Outline Dimensions ....................................................... 23

Changes to Ordering Guide .......................................................... 23

4/11—Rev. A to Rev. B

Changes to Features Section and Applications Section............... 1

Added Exposed Pad Notation to Outline Dimensions ............. 23

Changes to Ordering Guide .......................................................... 23

Added Automotive Products Section .......................................... 23

9/07—Rev. 0 to Rev. A

Changes to Features and General Description ............................. 1

Changes to Table 2............................................................................ 3

Changes to Table 3............................................................................ 5

Changes to Typical Performance Characteristics Layout............ 9

Inserted Figure 3 to Figure 8; Renumbered Sequentially............ 9

Inserted Figure 9; Renumbered Sequentially.............................. 10

Inserted Figure 16, and Figure 18 to Figure 20; Renumbered

Sequentially ..................................................................................... 11

Inserted Figure 24; Renumbered Sequentially ........................... 12

Deleted Figure 28 and Figure 29; Renumbered Sequentially ... 13

Inserted Figure 33 and Figure 34; Renumbered Sequentially .. 14

Inserted Figure 41 to Figure 46; Renumbered Sequentially ..... 16

Inserted Figure 48; Renumbered Sequentially ........................... 17

Changes to Gain Selection Section and Figure 50 ..................... 18

Added Input Protection Section................................................... 19

Added Reducing Noise Section .................................................... 20

Changes to Multiplexing Section ................................................. 21

Added Using the AD8231 with Bipolar Supplies Section ......... 21

Added Sallen Key Filter Section ................................................... 22

Changes to Ordering Guide .......................................................... 23

5/07—Revision 0: Initial Version