AD628ARZ-R7 Datasheet

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps


The AD628ARZ-R7 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 AD628ARZ-R7 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within theinput range of single-supply ADCs. The AD628ARZ-R7 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 lowpass filter. The AD628ARZ-R7 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. AD628ARZ-R7 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 AD628ARZ-R7 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


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