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AD629:  High Common-Mode Voltage, Difference Amplifier

Product Status:   Production 

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 (including die) 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. C, 4/11

    DATA SHEET
      • 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

    Functional Block Diagram for AD629

    AD629 Diagram
    Functional Block Diagram for AD629
    View Full Circuit Note Enlarge
    Products Used in This Circuit
    • AD629: High Common-Mode Voltage, Difference Amplifier
    • AD7170: 12-Bit Low Power Σ−Δ ADC
    • AD8475: Precision, Selectable Gain, Fully Differential Funnel Amp
    • AD8622: Dual, Low Power, Low Noise, Low Bias Current, Precision Rail-to-Rail Output Op Amp
    • ADR435: Ultralow Noise XFET® Voltage References with Current Sink and Source Capability
    • ADUM5402: Quad-Channel Isolators with Integrated DC/DC Converter
    More
    Circuit Design Assistance:
    • Design & Integration Files
    View Full Circuit Note Enlarge
    Circuit Benefits and Features:
    • Measure -48V High Side Current
    • Optimized for High Precision
    • Designed for Wireless Base Station and Telecommunication Equipment
    Products Used in This Circuit
    • AD629: High Common-Mode Voltage, Difference Amplifier
    • AD7453: Pseudo Differential, 555 kSPS, 12-Bit A/D Converter in 8-Lead SOT-23
    • AD780: 2.5 V/3.0 V Ultrahigh Precision Bandgap Voltage Reference
    • AD8603: Precision Single MicroPower Rail to Rail Input/Output Low Noise CMOS Operational Amplifier
    More

    Circuits from the Lab™ reference circuits are engineered and tested for quick and easy system integration to help solve today's analog, mixed-signal, and RF design challenges.

    Budgetary Price & Packaging   |   Samples   |   Check Inventory & Purchase

    AD629 Model Options
    Model Package Pins Temp.
    Range    		 Packing,
    Qty    		 Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD629AN Status: Last Time Buy 8 ld PDIP 8 Ind Tube, 50 $4.05 $3.45 N  Material Info PCN/PDN Purchase
    AD629ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $3.59 $3.05 Y  Material Info PCN Purchase
    AD629AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.86 $3.29 N  Material Info PCN Purchase
    AD629AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.29 N  Material Info PCN Purchase
    AD629AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $3.29 N  Material Info PCN Purchase
    AD629ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.42 $2.90 Y  Material Info PCN Purchase
    AD629ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.90 Y  Material Info PCN Purchase
    AD629ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.90 Y  Material Info PCN Purchase
    AD629BNZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $5.54 $4.69 Y  Material Info PCN Purchase
    AD629BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.96 $5.05 N  Material Info PCN Purchase
    AD629BR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $5.05 N  Material Info PCN Purchase
    AD629BR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $5.05 N  Material Info PCN Purchase
    AD629BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.28 $4.47 Y  Material Info PCN Purchase
    AD629BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.47 Y  Material Info PCN Purchase
    AD629BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $4.47 Y  Material Info PCN Purchase
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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.

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