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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

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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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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.