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AD628AR Datenblatt(PDF) 1 Page - Analog Devices |
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AD628AR Datenblatt(HTML) 1 Page - Analog Devices |
1 / 20 page High Common-Mode Voltage Programmable Gain Difference Amplifier AD628 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 rights of third parties that may result from its use. Specifications subject to change without notice. No 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES High common-mode input voltage range ±120 V at VS = ±15 V Gain range 0.1 to 100 Operating temperature range: −40°C to ±85°C Supply voltage range Dual supply: ±2.25 V to ±18 V Single supply: 4.5 V to 36 V Excellent ac and dc performance Offset temperature stability RTI: 10 µV/°C max Offset: ±1.5 V mV max CMRR RTI: 75 dB min, dc to 500 Hz, G = +1 APPLICATIONS High voltage current shunt sensing Programmable logic controllers Analog input front end signal conditioning +5 V, +10 V, ±5 V, ±10 V and 4 to 20 mA Isolation Sensor signal conditioning Power supply monitoring Electrohydraulic control Motor control GENERAL DESCRIPTION The AD628 is a precision difference amplifier that combines excellent dc performance with high common-mode rejection over a wide range of frequencies. When used to scale high voltages, it allows simple conversion of standard control voltages or currents for use with single-supply ADCs. A wideband feedback loop minimizes distortion effects due to capacitor charging of ∑-∆ ADCs. A reference pin (VREF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs. The AD628 has an input common-mode and differential mode operating range of ±120 V. The high common-mode input impedance makes the device well suited for high voltage measurements across a shunt resistor. The buffer amplifier’s inverting input is available for making a remote Kelvin connection. FUNCTIONAL BLOCK DIAGRAM REXT1 REXT2 RG +VS +IN –IN +IN –IN –VS A2 A1 +IN –IN 100k Ω 100k Ω 10k Ω 10k Ω VREF 10k Ω AD628 OUT G = +0.1 CFILT Figure 1. 30 40 50 60 70 80 90 100 110 120 130 FREQUENCY (Hz) 100 10 1k 10k 100k VS = ±2.5V VS = ±15V Figure 2. CMRR vs. Frequency of the AD628 A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a low- pass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC or MSOP package. It operates over the standard industrial temperature range of −40°C to +85°C. |
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