Datasheet

AD8420 Data Sheet
Rev. 0 | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Pin Configuration............................................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 19
Architecture................................................................................. 19
Setting the Gain .......................................................................... 19
Gain Accuracy ............................................................................ 20
Input Voltage Range................................................................... 20
Input Protection ......................................................................... 20
Layout .......................................................................................... 21
Driving the Reference Pin......................................................... 21
Input Bias Current Return Path ............................................... 22
Radio Frequency Interference (RFI)........................................ 22
Output Buffering ........................................................................ 23
Applications Information.............................................................. 24
AD8420 in Electrocardiography (ECG).................................. 24
Classic Bridge Circuit ................................................................ 25
4 mA to 20 mA Single-Supply Receiver .................................. 25
Outline Dimensions....................................................................... 26
Ordering Guide .......................................................................... 26
REVISION HISTORY
3/12—Revision 0: Initial Version