High Common-Mode Voltage, Programmable Gain Difference Amplifier
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 inverting input of the Buffer Amplifier is available for making a remote Kelvin connection.
A precision 10 k 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 40C to +85C.
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
Data Sheet, Rev. G, 4/07
By Analog Devices, Inc.
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