INA290

• Wide common-mode voltage:
  • Operational voltage: 2.7 V to 120 V
  • Survival voltage: −20 V to +122 V
• Excellent CMRR:
  • 160-dB DC
  • 85-dB AC at 50 kHz
• Accuracy
  • Gain:
    • Gain error: ±0.1% (maximum)
    • Gain drift: ±5 ppm/°C (maximum)
  • Offset:
    • Offset voltage: ±12 µV (maximum)
    • Offset drift: ±0.2 µV/°C (maximum)
• Available gains:
  • INA290A1: 20 V/V
  • INA290A2: 50 V/V
  • INA290A3: 100 V/V
  • INA290A4: 200 V/V
  • INA290A5: 500 V/V
• High bandwidth: 1.1 MHz
• Slew rate: 2 V/µs
• Quiescent current: 370 µA

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

The INA290 operates from a single 2.7-V to 20-V supply and draws a 370-µA supply current (typical). The INA290 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset of the zero-drift architecture enables current sensing with low ohmic shunts as specified over the extended operating temperature range (−40 °C to +125 °C).