High Resolution, Zero-Drift Current Shunt Monitor AD8217 FEATURES FUNCTIONAL BLOCK DIAGRAM High common-mode voltage range R4 AD8217 4.5 V to 80 V operating 0 V to 85 V survival R1 IN Buffered output voltage OUT +IN Wide operating temperature range: 40C to +125C R2 R3 Excellent ac and dc performance LDO 100 nV/C typical offset drift 100 V typical offset GND 5 ppm/C typical gain drift Figure 1. 100 dB typical CMRR at dc APPLICATIONS High side current sensing 48 V telecom Power management Base stations Unidirectional motor control Precision high voltage current sources GENERAL DESCRIPTION The AD8217 is a high voltage, high-resolution current shunt The AD8217 offers breakthrough performance throughout the amplifier. It features a set gain of 20 V/V, with a maximum 40C to +125C temperature range. It features a zero-drift 0.35% gain error over the entire temperature range. The core, which leads to a typical offset drift of 100 nV/C buffered output voltage directly interfaces with any typical throughout the operating temperature and common-mode converter. The AD8217 offers excellent common-mode rejection voltage range. Special attention is devoted to output linearity from 4.5 V to 80 V, and includes an internal LDO, which directly being maintained throughout the input differential voltage range powers the device from the high voltage rail. Therefore, no addi- of 0 mV to 250 mV, regardless of the common-mode voltage tional supply is necessary, provided that the input common-mode present, and the typical input offset voltage is 100 V. range is 4.5 V to 80 V. The AD8217 performs unidirectional The AD8217 is offered in a 8-lead MSOP package and is current measurements across a shunt resistor in a variety of specified from 40C to +125C. industrial and telecom applications including motor control, battery management, and base station power amplifier bias control. Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20102011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 09161-001AD8217 TABLE OF CONTENTS Features .............................................................................................. 1 Amplifier Core............................................................................ 10 Applications....................................................................................... 1 Internal LDO............................................................................... 10 Functional Block Diagram .............................................................. 1 Application Notes........................................................................... 11 General Description ......................................................................... 1 Output Linearity......................................................................... 11 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications..................................................................................... 3 High-Side Current Sensing ....................................................... 12 Absolute Maximum Ratings............................................................ 4 Motor Control Current Sensing ............................................... 12 ESD Caution.................................................................................. 4 Outline Dimensions....................................................................... 13 Pin Configuration and Function Descriptions............................. 5 Ordering Guide .......................................................................... 13 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 10 REVISION HISTORY 3/11Rev. 0 to Rev. A Changes to Features.......................................................................... 1 Changes to Figure 18........................................................................ 8 7/10Revision 0: Initial Version Rev. A Page 2 of 16