High Common-Mode Voltage, Difference Amplifier AD629 FEATURES FUNCTIONAL BLOCK DIAGRAM Improved replacement for: INA117P and INA117KU 21.1k 380k NC REF() 1 8 270 V common-mode voltage range 380k 2 7 +V Input protection to IN S 380k 500 V common mode +IN 3 6 OUTPUT 20k 500 V differential mode 4 5 REF(+) V S Wide power supply range (2.5 V to 18 V) AD629 10 V output swing on 12 V supply NC = NO CONNECT 1 mA maximum power supply current Figure 1. GENERAL DESCRIPTION HIGH ACCURACY DC PERFORMANCE The AD629 is a difference amplifier with a very high input, 3 ppm maximum gain nonlinearity (AD629B) common-mode voltage range. It is a precision device that allows 20 V/C maximum offset drift (AD629A) the user to accurately measure differential signals in the 10 V/C maximum offset drift (AD629B) presence of high common-mode voltages up to 270 V. 10 ppm/C maximum gain drift The AD629 can replace costly isolation amplifiers in EXCELLENT AC SPECIFICATIONS applications that do not require galvanic isolation. The device 77 dB minimum CMRR 500 Hz (AD629A) operates over a 270 V common-mode voltage range and has 86 dB minimum CMRR 500 Hz (AD629B) inputs that are protected from common-mode or differential 500 kHz bandwidth mode transients up to 500 V. The AD629 has low offset, low offset drift, low gain error drift, APPLICATIONS low common-mode rejection drift, and excellent CMRR over a High voltage current sensing wide frequency range. Battery cell voltage monitors The AD629 is available in die and packaged form featuring Power supply current monitors 8-lead PDIP and 8-lead SOIC packages. For all packages Motor controls (including die) and grades, performance is guaranteed over Isolation the industrial temperature range of 40C to +85C. 100 2mV/DIV 95 90 85 80 75 70 65 60 60V/DIV 55 50 240 120 0 120 240 20 100 1k 10k 20k COMMON-MODE VOLTAGE (V) FREQUENCY (Hz) Figure 3. Error Voltage vs. Input Common-Mode Voltage Figure 2. Common-Mode Rejection Ratio vs. Frequency Rev. C 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 1999-2011 Analog Devices, Inc. All rights reserved. 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COMMON-MODE REJECTION RATIO (dB) 00783-002 OUTPUT ERROR (2mV/DIV) 00783-001 00783-003AD629 TABLE OF CONTENTS Features .............................................................................................. 1 Basic Connections...................................................................... 11 Applications....................................................................................... 1 Single-Supply Operation ........................................................... 11 Functional Block Diagram .............................................................. 1 System-Level Decoupling and Grounding.............................. 11 General Description ......................................................................... 1 Using a Large Sense Resistor..................................................... 12 Revision History ............................................................................... 2 Output Filtering.......................................................................... 12 Specifications..................................................................................... 3 Output Current and Buffering.................................................. 13 Absolute Maximum Ratings............................................................ 4 A Gain of 19 Differential Amplifier......................................... 13 ESD Caution.................................................................................. 4 Error Budget Analysis Example 1 ............................................ 13 Pin Configuration and Function Descriptions............................. 5 Error Budget Analysis Example 2 ............................................ 14 Typical Performance Characteristics ............................................. 6 Outline Dimensions....................................................................... 15 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 16 Applications..................................................................................... 11 REVISION HISTORY 4/11Rev. B to Rev. C 3/07Rev. A to Rev. B Changes to General Description Section ...................................... 1 Updated Format and Layout .............................................Universal Added Endnote 1 in Table 1............................................................ 3 Changes to Ordering Guide .......................................................... 15 Added Figure 5 Renumbered Sequentially .................................. 4 3/00Rev. 0 to Rev. A Added Table 3 Renumbered Sequentially .................................... 4 Added Pin Configuration and Function Descriptions Section, Figure 6, and Table 4 ........................................................................ 5 10/99Revision 0: Initial Version Changes to Ordering Guide .......................................................... 16 Rev. C Page 2 of 16