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AD629ARZ-RL Fiches technique(PDF) 1 Page - Analog Devices |
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AD629ARZ-RL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 16 page High Common-Mode Voltage, Difference Amplifier AD629 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 www.analog.com Fax: 781.461.3113 ©1999-2007 Analog Devices, Inc. All rights reserved. FEATURES Improved replacement for: INA117P and INA117KU ±270 V common-mode voltage range Input protection to ±500 V common mode ±500 V differential mode Wide power supply range (±2.5 V to ±18 V) ±10 V output swing on ±12 V supply 1 mA maximum power supply current HIGH ACCURACY DC PERFORMANCE 3 ppm maximum gain nonlinearity (AD629B) 20 μV/°C maximum offset drift (AD629A) 10 μV/°C maximum offset drift (AD629B) 10 ppm/°C maximum gain drift EXCELLENT AC SPECIFICATIONS 77 dB minimum CMRR @ 500 Hz (AD629A) 86 dB minimum CMRR @ 500 Hz (AD629B) 500 kHz bandwidth APPLICATIONS High voltage current sensing Battery cell voltage monitors Power supply current monitors Motor controls Isolation FUNCTIONAL BLOCK DIAGRAM 1 2 3 4 8 7 6 5 21.1kΩ 380kΩ 380kΩ 380kΩ 20kΩ REF(–) –IN +IN –VS NC +VS OUTPUT REF(+) AD629 NC = NO CONNECT Figure 1. GENERAL DESCRIPTION The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V. The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V. The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range. The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C. FREQUENCY (Hz) 100 50 55 60 65 70 75 80 85 90 95 20 100 1k 10k 20k Figure 2. Common-Mode Rejection Ratio vs. Frequency COMMON-MODE VOLTAGE (V) –240 240 120 –120 0 2mV/DIV 60V/DIV Figure 3. Error Voltage vs. Input Common-Mode Voltage |
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