AD8231
TABLE OF CONTENTS
Features .............................................................................................. 1
Amplifier Architecture .............................................................. 18
Gain Selection............................................................................. 18
Reference Terminal .................................................................... 18
Layout .......................................................................................... 19
Input Bias Current Return Path ............................................... 19
Input Protection ......................................................................... 19
RF Interference ........................................................................... 20
Common-Mode Input Voltage Range..................................... 20
Reducing Noise........................................................................... 20
Applications Information.............................................................. 21
Differential Output .................................................................... 21
Multiplexing................................................................................ 21
Using the AD8231 with Bipolar Supplies................................ 21
Sallen Key Filter.......................................................................... 22
Outline Dimensions....................................................................... 23
Ordering Guide .......................................................................... 23
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
Maximum Power Dissipation ..................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Instrumentation Amplifier Performance Curves..................... 9
Operational Amplifier Performance Curves .......................... 15
Performance Curves Valid for Both Amplifiers ..................... 17
Theory of Operation ...................................................................... 18
REVISION HISTORY
9/07—Rev. 0to Rev. A
5/07—Revision 0: Initial Version
Changes to Features and General Description ............................. 1
Changes to Table 2............................................................................ 3
Changes to Table 3............................................................................ 5
Changes to Typical Performance Characteristics Layout............ 9
Inserted Figure 3 to Figure 8; Renumbered Sequentially............ 9
Inserted Figure 9; Renumbered Sequentially.............................. 10
Inserted Figure 16, and Figure 18 to Figure 20; Renumbered
Sequentially ..................................................................................... 11
Inserted Figure 24; Renumbered Sequentially............................ 12
Deleted Figure 28 and Figure 29; Renumbered Sequentially ... 13
Inserted Figure 33 and Figure 34; Renumbered Sequentially... 14
Inserted Figure 41 to Figure 46; Renumbered Sequentially...... 16
Inserted Figure 48; Renumbered Sequentially............................ 17
Changes to Gain Selection Section and Figure 50 ..................... 18
Added Input Protection Section................................................... 19
Added Reducing Noise Section .................................................... 20
Changes to Multiplexing Section.................................................. 21
Added Using the AD8231 with Bipolar Supplies Section ......... 21
Added Sallen Key Filter Section ................................................... 22
Changes to Ordering Guide .......................................................... 23
Rev. A | Page 2 of 24
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