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.

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 control
Motor control