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Texas Instruments INA149 Common-Mode Voltage Difference Amplifier

Texas Instruments INA149 High Common-Mode Voltage Difference Amplifier features the industry's highest Common-Mode Rejection Ratio (CMRR) for high input common-mode voltage (CMV) applications. With 100dB (Typ.) CMRR, the INA149 unity-gain difference amplifier can accurately measure small differential voltages in the presence of common-mode signals up to ±275V. The Texas Instruments INA149 inputs are protected from momentary common-mode or differential overvoltage up to 500V. This feature makes it an ideal solution for high accuracy, high voltage industrial applications.

Features

  • ±275V Common-Mode Voltage Range
  • 90dB from -40°C to +125°C Minimum CMRR
  • DC Specifications
    • 1100µV Maximum Offset Voltage
    • 15µV/°C Maximum Offset Voltage Drift
    • 0.02% Maximum Gain Error
    • 10ppm/°C Maximum Gain Error Drift
    • 0.001% FSR Maximum Gain Nonlinearity
  • AC Performance
    • 500kHz Bandwidth
    • 5V/µs Typical Slew Rate
  • ±2.0V to ±18V Wide Supply Range
  • 900µA Maximum Quiescent Current
  • Output Swing on ±15-V Supplies: ±13.5V
  • Input Protection
    • ±500V Common-Mode
    • ±500V Differential

Applications

  • High-Voltage Current Sensing
  • Battery Cell Voltage Monitoring
  • Power-Supply Current Monitoring
  • Motor Controls
  • Replacement for Isolation Circuits

Videos

Pin Configuration

Application Circuit Diagram - Texas Instruments INA149 Common-Mode Voltage Difference Amplifier
Publicado: 2012-04-05 | Actualizado: 2022-03-11