link to page 1 link to page 1 link to page 1 link to page 1 link to page 2 link to page 3 link to page 7 link to page 7 link to page 7 link to page 8 link to page 9 link to page 20 link to page 20 link to page 20 link to page 21 link to page 21 link to page 21 link to page 22 link to page 22 link to page 22 link to page 23 link to page 23 link to page 25 link to page 25 link to page 25 link to page 26 link to page 27 link to page 27 AD8237Data SheetTABLE OF CONTENTS Features .. 1 Clock Feedthrough ... 21 Applications ... 1 Input Voltage Range ... 21 Pin Configuration ... 1 Input Protection ... 22 General Description ... 1 Filtering Radio Frequency Interference .. 22 Revision History ... 2 Using the Reference Pin .. 22 Specifications ... 3 Layout .. 23 Absolute Maximum Ratings .. 7 Input Bias Current Return Path ... 23 Thermal Resistance .. 7 Applications Information .. 25 ESD Caution .. 7 Battery Current Monitor ... 25 Pin Configuration and Function Descriptions ... 8 Programmable Gain In-Amp.. 25 Typical Performance Characteristics ... 9 AD8237 in an Electrocardiogram (ECG) Front End... 26 Theory of Operation .. 20 Outline Dimensions ... 27 Architecture ... 20 Ordering Guide .. 27 Setting the Gain .. 20 Gain Accuracy... 21 REVISION HISTORY 8/12—Revision 0: Initial Version Rev. 0 | Page 2 of 28 Document Outline Features Applications General Description Pin Configuration Table of Contents Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Architecture Setting the Gain Gain Accuracy Clock Feedthrough Input Voltage Range Input Protection Filtering Radio Frequency Interference Using the Reference Pin Layout Common-Mode Rejection Ratio over Frequency Power Supplies Reference Input Bias Current Return Path Applications Information Battery Current Monitor Programmable Gain In-Amp AD8237 in an ECG Front End Outline Dimensions Ordering Guide