INA331IDGKR

The Texas Instruments INA331IDGKR is a low-power, single-supply CMOS instrumentation amplifier. It is designed for cost-optimized applications requiring high gain accuracy, featuring a gain range from 5 V/V to 1000 V/V. The device operates over a supply voltage range of 2.5V to 5.5V.

Key electrical characteristics include a low input offset voltage of ±500 µV maximum, a high Common-Mode Rejection Ratio (CMRR) of 90 dB minimum, and a low input bias current of ±0.01 nA maximum. The bandwidth at minimum gain is 2 MHz, with a slew rate of 5 V/µs. The quiescent current is typically 0.415 mA.

The INA331IDGKR offers rail-to-rail output swing and operates across a wide temperature range of -55°C to 125°C. It is available in a VSSOP (DGK) 8-pin package with dimensions of 3 mm × 4.9 mm.

This instrumentation amplifier is suitable for various industrial sensor applications, including bridge, RTD, thermocouple, and position sensors. It is also used in physiological amplifiers (ECG, EEG, EMG), A/D converter signal conditioning, differential line receivers with gain, field utility meters, and audio amplifiers.