AD8233

Data Sheet

Rev. 0 | Page 2 of 29

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

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

 

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

 

Absolute Maximum Ratings............................................................ 6

 

Thermal Resistance ...................................................................... 6

 

Pin Configuration and Function Descriptions............................. 7

 

Typical Performance Characteristics ............................................. 8

 

Instrumentation Amplifier Performance Characteristics....... 8

 

Operational Amplifier Performance Characteristics............. 11

 

Right Leg Drive (RLD) Amplifier Performance

Characteristics ............................................................................ 14

 

Reference Buffer Performance Characteristics....................... 15

 

System Performance Characteristics ....................................... 16

 

Theory of Operation ...................................................................... 17

 

Architecture Overview .............................................................. 17

 

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

 

Operational Amplifier ............................................................... 17

 

Right Leg Drive Amplifier......................................................... 18

 

Reference Buffer ......................................................................... 18

 

Fast Restore Circuit.................................................................... 18

 

Leads On/Off Detection............................................................ 19

 

Standby Operation ..................................................................... 20

 

Input Protection ......................................................................... 21

 

Radio Frequency Interference (RFI)........................................ 21

 

Power Supply Regulation and Bypassing ................................ 21

 

Input Referred Offsets ............................................................... 21

 

Layout Recommendations ........................................................ 21

 

Applications Information .............................................................. 22

 

Eliminating Electrode Offsets................................................... 22

 

High-Pass Filtering..................................................................... 22

 

Low-Pass Filtering and Gain..................................................... 24

 

Driven Electrode ........................................................................ 25

 

Application Circuits ....................................................................... 26

 

Heart Rate Measurement (HRM) Next to the Heart............. 26

 

Exercise Application—Heart Rate Measured at the Hands .. 26

 

Holter Monitor Configuration ................................................. 27

 

Synchronized ECG and PPG Measurement ........................... 28

 

Packaging and Ordering Information ......................................... 29

 

Outline Dimensions................................................................... 29

 

Ordering Guide .......................................................................... 29

 

REVISION HISTORY

8/2016—Revision 0: Initial Version