Datasheet AD8218 (Analog Devices)

Zero Drift, Bidirectional Current Shunt Monitor Data Sheet AD8218 FEATURES FUNCTIONAL BLOCK DIAGRAM High common-mode voltage range VS 4 V to 80 V operating AD8218 R4 −0.3 V to +85 V survival Buffered output voltage R1 –IN Gain = 20 V/V OUT Wide operating temperature range: −40°C to +125°C +IN R2 LDO R3 Excellent ac and dc performance ENB ±100 nV/°C typical offset drift ±50 µV typical offset
001
GND REF ±5 ppm/°C typical gain drift
09592- Figure 1.
110 dB typical CMRR at dc APPLICATIONS High-side current sensing 48 V telecom Power management Base stations Bidirectional motor control Precision high voltage current sources GENERAL DESCRIPTION
The AD8218 is a high voltage, high resolution current shunt The AD8218 offers breakthrough performance throughout the amplifier. It features a set gain of 20 V/V, with a maximum −40°C to +125°C temperature range. It features a zero-drift core, ±0.35% gain error over the entire temperature range. The which leads to a typical offset drift of ±100 nV/°C throughout buffered output voltage directly interfaces with any typical the operating temperature range and the common-mode voltage converter. The AD8218 offers excel ent input common-mode range. Special attention is devoted to output linearity being rejection from 4 V to 80 V. The AD8218 performs bidirectional maintained throughout the input differential voltage range of current measurements across a shunt resistor in a variety of 0 mV to ~250 mV. The AD8218 also includes an internal 80 mV industrial and telecom applications, including motor control, reference that can be enabled for optimal dynamic range in battery management, and base station power amplifier bias unidirectional current sense applications. The typical input control. offset voltage is ±50 µV. The AD8218 is offered in an 8-lead MSOP package and an 8-lead LFCSP package.
Rev. B Document Feedback 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 rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Amplifier Core Output Clamping Application Notes Supply (VS) Connections Enable Pin (ENB) Operation Applications Information Unidirectional High-Side Current Sensing Bidirectional High-Side Current Sensing Motor Control Current Sensing Outline Dimensions Ordering Guide