INA188 - 36-V, Zero-Drift, Rail-to-Rail-Out Instrumentation Amplifier

The INA188 is a precision instrumentation amplifier that uses TI proprietary auto-zeroing techniques to achieve low offset voltage, near-zero offset and gain drift, excellent linearity, and exceptionally low-noise density (12 nV/√Hz) that extends down to dc.

The INA188 is optimized to provide excellent common-mode rejection of greater than 104 dB (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 4-V single supply as well as dual supplies up to ±18 V, and a wide, high-impedance input range. These specifications make this device ideal for universal signal measurement and sensor conditioning (such as temperature or bridge applications).

A single external resistor sets any gain from 1 to 1000. The INA188 is designed to use an industry-standard gain equation: G = 1 + (50 kΩ / R_G). The reference pin can be used for level-shifting in single-supply operation or for an offset calibration.

The INA188 is specified over the temperature range of –40°C to +125°C .

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