Texas Instruments INA188 Zero-Drift Instrumentation Amplifier

Texas Instruments INA188 Precision Zero-Drift Instrumentation Amplifier uses auto-zeroing techniques to achieve low offset voltage, near-zero offset, and gain drift. It also features excellent linearity and exceptionally low-noise density (12nV/√Hz) that extends down to dc. The INA188 is optimized to provide excellent common-mode rejection of greater than 104dB (G≥10). Superior common-mode and supply rejection supports high-resolution, precise measurement applications. The versatile three op-amp design offers a rail-to-rail output, low-voltage operation from a 4V single supply. It also offers dual supplies up to ±18V, and a wide, high-impedance input range. These specifications make this device ideal for universal signal measurement and sensor conditioning.

Features

  • Excellent DC Performance
    • Low Input Offset Voltage: 55µV (max)
    • Low Input Offset Drift: 0.2µV/°C (max)
    • High CMRR: 104dB, G ≥ 10 (min)
  • Low Input Noise
    • 12nV/√Hz at 1kHz
    • 0.25µVPP (0.1Hz to 10Hz)
  • Wide Supply Range
    • Single Supply: 4V to 36V
    • Dual Supply: ±2V to ±18V
  • Gain Set with a Single External Resistor
    • Gain Equation: G = 1 + (50kΩ / RG)
    • Gain Error: 0.007%, G = 1
    • Gain Drift: 5ppm/°C (max) G = 1
  • Input Voltage: (V-) + 0.1V to (V+) - 1.5V
  • RFI-Filtered Inputs
  • Rail-to-Rail Output
  • Low Quiescent Current: 1.4mA
  • Operating Temperature: -55°C to +150°C
  • SOIC-8 and DFN-8 Packages

Applications

  • Bridge amplifiers
  • ECG Amplifiers
  • Pressure sensors
  • Medical instrumentation
  • Portable instrumentation
  • Weigh scales simplified schematic
  • Thermocouple amplifiers
  • RTD Sensor amplifiers
  • Data acquisition

Simplified Schematic

Texas Instruments INA188 Zero-Drift Instrumentation Amplifier
Publicado: 2015-12-02 | Actualizado: 2022-03-11