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AD8218 Folha de dados(PDF) 1 Page - Analog Devices |
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AD8218 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 16 page Zero Drift, Bidirectional Current Shunt Monitor Data Sheet AD8218 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES High common-mode voltage range 4 V to 80 V operating −0.3 V to +85 V survival Buffered output voltage Gain = 20 V/V Wide operating temperature range: −40°C to +125°C Excellent ac and dc performance ±100 nV/°C typical offset drift ±50 µV typical offset ±5 ppm/°C typical gain drift 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 FUNCTIONAL BLOCK DIAGRAM LDO R2 R1 AD8218 R4 R3 +IN –IN OUT ENB REF GND VS Figure 1. GENERAL DESCRIPTION The AD8218 is a high voltage, high resolution current shunt amplifier. It features a set gain of 20 V/V, with a maximum ±0.35% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8218 offers excellent input common-mode rejection from 4 V to 80 V. The AD8218 performs bidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications, including motor control, battery management, and base station power amplifier bias control. The AD8218 offers breakthrough performance throughout the −40°C to +125°C temperature range. It features a zero-drift core, which leads to a typical offset drift of ±100 nV/°C throughout the operating temperature range and the common-mode voltage range. Special attention is devoted to output linearity being maintained throughout the input differential voltage range of 0 mV to ~250 mV. The AD8218 also includes an internal 80 mV reference that can be enabled for optimal dynamic range in unidirectional current sense applications. The typical input offset voltage is ±50 µV. The AD8218 is offered in an 8-lead MSOP package and an 8-lead LFCSP package. |
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