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AD628ARMZ-RL bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD628ARMZ-RL bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 20 page High Common-Mode Voltage, Programmable Gain Difference Amplifier AD628 Rev. G 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 ©2002–2007 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 maximum Offset: ±1.5 V mV maximum CMRR RTI: 75 dB minimum, 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 controls Motor controls 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 Σ-Δ 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 inverting input of the buffer amplifier is available for making a remote Kelvin connection. FUNCTIONAL BLOCK DIAGRAM +IN –IN +IN –IN –VS VREF REXT1 RG +VS REXT2 CFILT A2 A1 +IN –IN 100kΩ 100kΩ 10kΩ 10kΩ 10kΩ AD628 OUT G = +0.1 8 1 2 3 4 5 6 7 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_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C. |
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