Zero-drift Instrumentation Amplifier Targeted at Portable, Precision Applications

(Product News, 21 Jul 2008)

Providing an unmatched combination of precision, low power and low supply voltage, Texas Instruments Inc.'s (TI) INA333 is said to be the industry's lowest power zero-drift instrumentation amplifier. The device features the lowest quiescent current and lowest input bias current versus the nearest competition, as well as an impressive power-to-noise ratio, very low offset voltage/drift and 1.8V operation. Consequently, the INA333 improves accuracy and stability while extending battery life in a variety of precision, low-power applications such as portable medical, data acquisition, weigh scales and handheld instrumentation.

The INA333 utilizes TI's zero-drift technology, which incorporates a proprietary switched-capacitor notch filter to eliminate chopping noise and provide very low input voltage noise of 50nV/rt-Hz. The device features a versatile three op amp architecture to simplify design and reduce board space.

With only 75µA of quiescent current and operation on power supplies as low as 1.8V, the INA333 maximizes power efficiency. Low offset voltage of 25µV and offset drift of 0.1µV/°C deliver excellent accuracy and long-term stability. Applications with high impedance sources will benefit from low input bias current of 200pA.

Special filters have been integrated in series with the inputs of the INA333 to reduce radio frequency (RF) interference. This can dramatically reduce susceptibility to RF-induced offset voltage variations, which can be a critical advantage in applications that require DC stability, such as weigh scales.

Click here for more information on Texas Instruments' INA333 zero-drift instrumentation amplifier

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