Ultra-Precise Current Sense Amplifier - 500 V/V Gain

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Texas Instruments INA290 Ultra-Precise Current Sense Amplifiers can measure voltage drops across shunt resistors over a wide common-mode range from 2.7V to 120V. It is in a highly space-efficient SC-70 package with a PCB footprint of only 2.0mm × 2.1mm. The ultra-precise current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±12µV (maximum), a small gain error of ±0.1% (maximum), and a high DC CMRR of 160dB (typical). The INA290 is not only designed for DC current measurement but also high-speed applications (like fast overcurrent protection, for example) with high bandwidth of 1MHz (at a gain of 20V/V) and an 85dB AC CMRR (at 50kHz).

The INA290 operates from a single 2.7V to 20V supply and draws a 370µA supply current (typical).

  • Wide common-mode voltage
    • 2.7V to 120V operational voltage
    • −20V to +122V survival voltage
  • Excellent CMRR
    • 160dB DC
    • 85dB AC at 50kHz
  • Accuracy
    • Gain
      • ±0.1% (maximum) gain error
      • ±5ppm/°C (maximum) gain drift
    • Offset
      • ±12µV (maximum) offset voltage
      • ±0.2µV/°C (maximum) offset drift
  • 1.1MHz high bandwidth
  • 2V/µs slew rate
  • 370µA quiescent current


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