AD8232 Data Sheet
Rev. D | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ...................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications .................................................................................... 4
Absolute Maximum Ratings ........................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions ............................ 8
Typical Performance Characteristics ............................................. 9
Instrumentation Amplifier Performance Curves .................... 9
Operational Amplifier Performance Curves .......................... 12
Right Leg Drive (RLD) Amplifier Performance Curves ....... 15
Reference Buffer Performance Curves .................................... 16
System Performance Curves ..................................................... 17
Theory of Operation ...................................................................... 18
Architecture Overview .............................................................. 18
Instrumentation Amplifier ....................................................... 18
Operational Amplifier ............................................................... 18
Right Leg Drive Amplifier ......................................................... 19
Reference Buffer ......................................................................... 19
Fast Restore Circuit .................................................................... 19
Leads Off Detection ................................................................... 20
Standby Operation ..................................................................... 21
Input Protection ......................................................................... 21
Radio Frequency Interference (RFI) ....................................... 22
Power Supply Regulation and Bypassing ................................ 22
Input Referred Offsets ............................................................... 22
Layout Recommendations ........................................................ 22
Applications Information ............................................................. 23
Eliminating Electrode Offsets ................................................... 23
High-Pass Filtering .................................................................... 23
Low-Pass Filtering and Gain .................................................... 26
Driving Analog-to-Digital Converters .................................... 26
Driven Electrode ........................................................................ 26
Application Circuits ....................................................................... 27
Heart Rate Measurement Next to the Heart .......................... 27
Exercise Application: Heart Rate Measured at the Hands ... 27
Cardiac Monitor Configuration ............................................... 28
Portable Cardiac Monitor with Elimination of Motion
Artifacts ....................................................................................... 28
Packaging and Ordering Information ......................................... 30
Outline Dimensions ................................................................... 30
Ordering Guide .......................................................................... 31
REVISION HISTORY
3/2020—Rev. C to Rev. D
Added LFCSP_SS Package ........................................... Throughout
Changes to Features Section and General Description Section ...... 1
Changes to Specifications Section and Table 1 ............................ 4
Changes to Operating Temperature Range Parameter, Table 2 ...... 7
Changes to Figure 16 to Figure 20 ............................................... 11
Changes to Figure 29 ..................................................................... 13
Changes to Figure 32 and Figure 33 ............................................ 14
Changes to Figure 35 ..................................................................... 15
Changes to Figure 42 ..................................................................... 16
Changes to Figure 43 and Figure 44 ............................................ 17
Changes to Figure 45 ..................................................................... 18
Added Figure 70 ............................................................................. 30
Changes to Ordering Guide .......................................................... 31
6/2018—Rev. B to Rev. C
Changes to Figure 24 ..................................................................... 10
Changes to Radio Frequency Interference (RFI) Section ......... 20
Updated Outline Dimensions ....................................................... 27
3/2017—Rev. A to Rev. B
Updated Outline Dimensions ...................................................... 27
Changes to Ordering Guide .......................................................... 27
2/2013—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