AD8232
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
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
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
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 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
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
8/12—Revision 0: Initial Version
Rev. A | Page 2 of 28
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