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AD629:  High Common-Mode Voltage, Difference Amplifier

The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V.

The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode ...More

AD629:  High Common-Mode Voltage, Difference Amplifier

Product Description

The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V.

The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.

The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.

The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C.

Applications

  • High voltage current sensing
  • Battery cell voltage monitors
  • Power supply current monitors
  • Motor controls
  • Isolation

    • Data Sheet, Rev. B, 2/07

    RESOURCES & TOOLS

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    • Improved replacement for: INA117P and INA117KU
    • ±270 V common-mode voltage range
    • Input protection to
      ±500 V common mode
      ±500 V differential mode
      Wide power supply range (±2.5 V to ±18 V)
      ±10 V output swing on ±12 V supply
      1 mA maximum power supply current
    • HIGH ACCURACY DC PERFORMANCE
      3 ppm maximum gain nonlinearity (AD629B)
      20 μV/°C maximum offset drift (AD629A)
      10 μV/°C maximum offset drift (AD629B)
      10 ppm/°C maximum gain drift
    • EXCELLENT AC SPECIFICATIONS
      77 dB minimum CMRR @ 500 Hz (AD629A)
      86 dB minimum CMRR @ 500 Hz (AD629B)
      500 kHz bandwidth
    • Single/Dual Supply: Dual
    • Voltage Supply (Vmax) : ±18V
    • Gain Setting Method: fixed
    • Gain Range (min to max): 1
    • Bandwidth G=10 (kHz typ): 500kHz
    • CMRR (dB): 90dB
    • Vnoise RTI 1-10 Hz µVp-p : 15µV p-p
    • Temperature Range: -40 to +85
    • Gain Error (%) max: +0.03%
    • Supply Current : 1mA
    • Package: DIP,SOIC
    • Vosi (µV): 500µV

    Functional Block Diagram for AD629

    AD629 Diagram
    Functional Block Diagram for AD629

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