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AD628:  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 Σ-Δ ADCs.

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AD628:  High Common-Mode Voltage, Programmable Gain Difference Amplifier

Product 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.

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.

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

    RESOURCES & TOOLS

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    • 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
    • Single/Dual Supply: Single/Dual
    • Voltage Supply (Vmax) : ±18V
    • Gain Setting Method: Pin,Resistor
    • Gain Range (min to max): 100
    • Bandwidth G=10 (kHz typ): 600kHz
    • CMRR (dB): 75dB
    • Vnoise RTI 1-10 Hz µVp-p : 15µV p-p
    • Temperature Range: -40 to +85
    • Gain Error (%) max: +0.1%
    • Supply Current : 1.6mA
    • Package: SOIC
    • Vosi (µV): 1500µV

    Functional Block Diagram for AD628

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