Single-Supply 42 V System Difference Amplifier Data Sheet AD8205 FEATURES FUNCTIONAL BLOCK DIAGRAM V+ Ideal for current shunt applications 6 High common-mode voltage range +IN 8 2 V to +65 V operating 5 OUT 25 V to +75 V survival 1 IN Gain = 50 V/V Wide operating temperature range: 7 V 1 AD8205 REF 40C to +125C for Y and W grade 40C to +150C for H grade 3 V 2 REF Bidirectional operation NC 4 Available in 8-lead SOIC 2 Qualified for automotive applications GND NC = NO CONNECT Figure 1. EXCELLENT AC AND DC PERFORMANCE 15 V/C offset drift 30 ppm/C gain drift 80 dB CMRR dc to 20 kHz APPLICATIONS High-side current sensing in: Motor controls Transmission controls Diesel injection controls Engine management Suspension controls Vehicle dynamic controls DC-to-dc converters GENERAL DESCRIPTION The AD8205 is a single-supply difference amplifier for than 15 V/C, and gain drift is typically below 30 ppm/C. amplifying small differential voltages in the presence of large The output offset can be adjusted from 0.05 V to 4.8 V with a common-mode voltages. The operating input common-mode 5 V supply by using the VREF1 and VREF2 pins. With VREF1 voltage range extends from 2 V to +65 V. The typical single- attached to the V+ pin, and VREF2 attached to the GND pin, the supply voltage is 5 V. output is set at half scale. Attaching both pins to GND causes The AD8205 is offered in an 8-lead SOIC package and rated for the output to be unipolar, starting near ground. Attaching both operation from 40C to +125C for the Y and W grade pins to V+ causes the output to be unipolar starting near V+. models. The H grade version of the AD8205 is rated from Other offsets can be obtained by applying an external voltage to 40C to +150C. the V 1 and V 2 pins. REF REF Excellent dc performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically less Rev. D 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. 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All rights reserved. 04315-0-001AD8205 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Unidirectional Operation .............................................................9 Excellent AC and DC Performance ................................................ 1 Ground Referenced Output .........................................................9 Applications ....................................................................................... 1 V+ Referenced Output .................................................................9 Functional Block Diagram .............................................................. 1 Bidirectional Operation ................................................................9 General Description ......................................................................... 1 External Reference Output ........................................................ 10 Revision History ............................................................................... 2 Splitting the Supply .................................................................... 10 Specif icat ions ..................................................................................... 3 Splitting an External Reference ................................................ 10 Absolute Maximum Ratings ............................................................ 4 Applications Information .............................................................. 11 ESD Caution .................................................................................. 4 High-Side Current Sense with a Low-Side Switch ................. 11 Pin Configuration and Function Descriptions ............................. 5 High-Side Current Sense with a High-Side Switch ............... 11 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 12 Theory of Operation ........................................................................ 8 Ordering Guide .......................................................................... 12 Output Offset Adjustment ............................................................... 9 Automotive Products ................................................................. 12 REVISION HISTORY 4/12Rev. C to Rev. D Added H Grade Temperature Range to Table 2 ........................... 4 3/12Rev. B to Rev. C Added H Grade Models (Throughout) ......................................... 1 Added Unit of V/V to Gain in Features Section........................... 1 Added Radiometric Accuracy Maximum Parameter of 0.503 V/V, Operating Range Maximum Parameter of 5.5 V, and H Grade Specifications (Table 1) .................................................................... 3 Changes to Theory of Operation Section ...................................... 8 Changes to Ordering Guide .......................................................... 12 7/10Rev. A to Rev. B Changes to Features Section and General Description Section . 1 Delete Die Columns, Table 1 ........................................................... 3 Changes to Table 2 ............................................................................ 4 Changes to Figure 4 and Figure 6 ................................................... 6 Changes to Theory of Operation Section ...................................... 8 Changes to Ordering Guide .......................................................... 12 Added Automotive Products Section .......................................... 12 10/09Rev. 0 to Rev. A Changes to Output Resistance Parameter, Table 1 ....................... 3 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 4/04Revision 0: Initial Version Rev. D Page 2 of 12