High Common-Mode Voltage, Single-Supply Difference Amplifier Data Sheet AD8203 FEATURES FUNCTIONAL BLOCK DIAGRAMS NC A1 A2 +V High common-mode voltage range S 6 3 4 7 6 V to +30 V at a 5 V supply voltage AD8203 Operating temperature range: 40C to +125C 100k Supply voltage range: 3.5 V to 12 V G = 7 G = 2 Low-pass filter (1-pole or 2-pole) 8 +IN +IN +IN 5 OUT A1 A2 Excellent ac and dc performance 1 IN IN IN 10k 1 mV voltage offset (8-lead SOIC) 200k 200k 1 ppm/C typical gain drift 10k 80 dB CMRR minimum dc to 10 kHz APPLICATIONS 2 NC = NO CONNECT GND Transmission control Diesel injection control Figure 1. Functional Block Diagram Engine management Adaptive suspension control INDUCTIVE Vehicle dynamics control LOAD 5V CLAMP OUTPUT DIODE +IN +V NC OUT S GENERAL DESCRIPTION BATTERY 14V The AD8203 is a single-supply difference amplifier for amplify- 4-TERM AD8203 ing and low-pass filtering small differential voltages in the SHUNT presence of a large common-mode voltage (CMV). The input IN GND A1 A2 CMV range extends from 6 V to +30 V at a typical supply POWER DEVICE voltage of 5 V. The AD8203 is available in packaged form. The MSOP and SOIC packages are specified over a wide temperature range, COMMON NC = NO CONNECT from 40C to +125C, making the AD8203 well-suited for use Figure 2. High Line Current Sensor in many automotive platforms. Automotive platforms demand precision components for better POWER DEVICE 5V system control. The AD8203 provides excellent ac and dc OUTPUT performance keeping errors to a minimum in the users system. +IN +V NC OUT S Typical offset and gain drift in the SOIC package are 0.3 V/C and BATTERY 14V 1 ppm/C, respectively. Typical offset and gain drift in the MSOP 4-TERM AD8203 package are 2 V/C and 1 ppm/C, respectively. The device also SHUNT delivers a minimum CMRR of 80 dB from dc to 10 kHz. IN GND A1 A2 The AD8203 features an externally accessible 100 k resistor at CLAMP the output of the Preamp A1, which can be used for low-pass INDUCTIVE DIODE LOAD filter applications and for establishing gains other than 14. COMMON NC = NO CONNECT Figure 3. Low Line Current Sensor Rev. D 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 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 20042013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 05013-001 05013-003 05013-002AD8203 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 12 Applications ....................................................................................... 1 Applications ..................................................................................... 14 Functional Block Diagrams ............................................................. 1 Current Sensing .......................................................................... 14 Revision History ............................................................................... 2 Gain Adjustment ........................................................................ 14 Specifications ..................................................................................... 3 Gain Trim .................................................................................... 15 Single Supply ................................................................................. 3 Low-Pass Filtering ...................................................................... 15 Absolute Maximum Ratings ............................................................ 4 High Line Current Sensing with LPF and Gain Adjustment 16 ESD Caution .................................................................................. 4 Driving Charge Redistribution ADCs ..................................... 16 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ....................................................................... 17 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 17 REVISION HISTORY Changes to Ordering Guide .......................................................... 17 4/13Rev. C to Rev. D Changes to Initial System Gain Parameter .................................... 3 2/05Rev. 0 to Rev. A 2/13Rev. B to Rev. C Changes to Specifications Table ...................................................... 3 Changes to Features Section and General Description Section ........ 1 Changes to Caption on Figure 6 and Figure 8 ............................... 6 Changes to Table 1 ............................................................................ 3 Changes to Figure 12 ......................................................................... 7 Updated Outline Dimensions ....................................................... 17 Added Figure 14 to Figure 23 .......................................................... 7 Changes to Ordering Guide .......................................................... 17 Changes to Figure 26 and Figure 27 ............................................ 10 10/05Rev. A to Rev. B Changes to Figure 29 ...................................................................... 11 Added SOIC Package ......................................................... Universal Changes to Figure 32 and Figure 33 ............................................ 12 Replaced Figure 23 ........................................................................... 8 Changes to Ordering Guide .......................................................... 13 Added Figure 24 to Figure 29.......................................................... 9 10/04Revision 0: Initial Version Changes to Theory of Operation Section ................................... 12 Added Figure 41 .............................................................................. 12 Updated Outline Dimensions ....................................................... 17 Rev. D Page 2 of 20