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. 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 SOICN or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C. 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 * 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 https://elecena.pl/product/187477/high-common-mode-voltage-programmable-gain-difference-amplifier 2007-02-22 https://elecena.pl/product/187477/high-common-mode-voltage-programmable-gain-difference-amplifier 2018-03-28 https://elecena.pl/product/187477/high-common-mode-voltage-programmable-gain-difference-amplifier 2025-01-22