Zero-Drift, High Voltage, Bidirectional Difference Amplifier AD8207 FEATURES FUNCTIONAL BLOCK DIAGRAM V+ Ideal for current shunt applications EMI filters included +IN ZERO 1 V/C maximum input offset drift OUT DRIFT IN High common-mode voltage range AD8207 4 V to +65 V operating (5 V supply) 4 V to +35 V operating (3.3 V supply) 25 V to +75 V survival V 1 REF Gain = 20 V/V RANGE REF 3.3 V to 5.5 V supply range V 2 REF Wide operating temperature range: 40C to +125C Bidirectional current monitoring <500 nV/C typical offset drift GND <10 ppm/C typical gain drift Figure 1. >90 dB CMRR dc to 10 kHz Qualified for automotive applications APPLICATIONS High-side current sensing in Motor control Solenoid control Engine management Electric power steering Suspension control Vehicle dynamic control DC-to-DC converters GENERAL DESCRIPTION The AD8207 is a single-supply difference amplifier ideal for The AD8207 is ideal for bidirectional current sensing amplifying small differential voltages in the presence of large applications. It features two reference pins,VREF1 and VREF2, common-mode voltage. The operating input common-mode that allow the user to easily offset the output of the device to voltage range extends from 4 V to +65 V with a 5 V supply. any voltage within the supply range. With V 1 attached to the REF The AD8207 works with a single-supply voltage of 3.3 V to 5 V, V+ pin and V 2 attached to the GND pin, the output is set at REF and is ideally suited to withstand large input PWM common- half scale. Attaching both pins to GND causes the output to mode voltages, typical in solenoid and motor control applications. be unipolar, starting near ground. Attaching both pins to V+ causes the output to be unipolar starting near V+. Other output The AD8207 is available in an 8-lead SOIC package. Excellent offsets are achieved by applying an external low impedance dc performance over temperature keeps errors in the mea- voltage to the VREF1 and VREF2 pins. surement loop to a minimum. Offset drift is typically less than 500 nV/C, and gain drift is typically below 10 ppm/C. Rev. 0 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 2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 09160-001AD8207 TABLE OF CONTENTS Features .............................................................................................. 1 Output Offset Adjustment ............................................................ 12 Applications ....................................................................................... 1 Unidirectional Operation .......................................................... 12 Functional Block Diagram .............................................................. 1 Bidirectional Operation ............................................................. 12 General Description ......................................................................... 1 External Referenced Output ..................................................... 13 Revision History ............................................................................... 2 Splitting the Supply .................................................................... 13 Specif icat ions ..................................................................................... 3 Splitting an External Reference ................................................ 13 Absolute Maximum Ratings ............................................................ 4 Applications Information .............................................................. 14 ESD Caution .................................................................................. 4 Motor Control ............................................................................. 14 Pin Configuration and Function Descriptions ............................. 5 Solenoid Control ........................................................................ 15 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 16 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 16 Power Supply Adjustment ............................................................. 11 Automotive Products ................................................................. 16 3.3 V to 4.5 V Supply Operation .............................................. 11 4.5 V to 5.5 V Supply Operation .............................................. 11 REVISION HISTORY 7/10Revision 0: Initial Version Rev. 0 Page 2 of 16