AD8232

Data Sheet

Rev. A | Page 2 of 28

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

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

 

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

 

Absolute Maximum Ratings............................................................ 5

 

ESD Caution.................................................................................. 5

 

Pin Configuration and Function Descriptions............................. 6

 

Typical Performance Characteristics ............................................. 7

 

Instrumentation Amplifier Performance Curves..................... 7

 

Operational Amplifier Performance Curves .......................... 10

 

Right Leg Drive (RLD) Amplifier Performance Curves ....... 13

 

Reference Buffer Performance Curves .................................... 14

 

System Performance Curves ..................................................... 15

 

Theory of Operation ...................................................................... 16

 

Architecture Overview .............................................................. 16

 

Instrumentation Amplifier........................................................ 16

 

Operational Amplifier ............................................................... 16

 

Right Leg Drive Amplifier......................................................... 17

 

Reference Buffer ......................................................................... 17

 

Fast Restore Circuit .................................................................... 17

 

Leads Off Detection ................................................................... 18

 

Standby Operation ..................................................................... 19

 

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

 

Radio Frequency Interference (RFI)........................................ 20

 

Power Supply Regulation and Bypassing ................................ 20

 

Input Referred Offsets ............................................................... 20

 

Layout Recommendations ........................................................ 20

 

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

 

Eliminating Electrode Offsets .................................................. 21

 

High-Pass Filtering .................................................................... 21

 

Low-Pass Filtering and Gain..................................................... 23

 

Driving Analog-to-Digital Converters.................................... 23

 

Driven Electrode ........................................................................ 23

 

Application Circuits ....................................................................... 24

 

Heart Rate Measurement Next to the Heart........................... 24

 

Exercise Application: Heart Rate Measured at the Hands .... 24

 

Cardiac Monitor Configuration ............................................... 25

 

Portable Cardiac Monitor with Elimination of Motion

Artifacts ....................................................................................... 25

 

Packaging and Ordering Information ......................................... 27

 

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

 

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

 

REVISION HISTORY

2/13—Rev. 0 to Rev. A

Changes to Table 1............................................................................ 4

Changes to Table 2............................................................................ 6

Change to Figure 17 ......................................................................... 9

Changes to Figure 22 and Figure 25............................................. 11

Changes to Figure 34 and Figure 36............................................. 14

Changes to Figure 45, Architecture Overview Section, and

Instrumentation Amplifier Section.............................................. 17

Changes to Right Leg Drive Amplifier Section, Reference Buffer

Section, Fast Restore Circuit Section, and Figure 48; Added

Figure 46, Renumbered Sequentially ........................................... 18

Changes to Figure 49...................................................................... 19

Changes to AC Leads Off Detection Section and Standby

Operation Section........................................................................... 20

Changes to Input Referred Offsets Section................................. 21

Changes to Figure 53 and High-Pass Filtering Section............. 22

Changes to Additional High-Pass Filtering Options Section;

Added Table 4 ................................................................................. 23

Changes to Low-Pass Filtering and Gain Section; Added Driving

Analog-to-Digital Converters Section and Figure 61................ 24

Changes to Figure 62, Figure 64, and Heart Rate Measurement

Next to the Heart Section .............................................................. 25

Changes to Exercise Application: Heart Rate Measured at the

Hands and Figure 66 ...................................................................... 26

Changes to Figure 68...................................................................... 27

8/12—Revision 0: Initial Version