Zero-drift instrumentation amp claims lowest quiescent, input bias currents

Zero-drift instrumentation amp claims lowest quiescent, input bias currents

Improves accuracy and extends battery life for portable, precision apps

The INA333 zero-drift instrumentation amplifier provides, according to the company, the lowest quiescent current (75 μA) and the lowest input bias current (200 pA) compared to the nearest competition. Consequently, the company also claims an impressive power-to-noise ratio, a very low offset voltage of 25 μV, offset drift of 0.1 μV/C, and 1.8-V operation improving accuracy and stability while extending battery life in a variety of precision, low-power applications such as portable medical, data acquisition, weighing, and handheld instrumentation.

The INA333 uses the company’s zero-drift technology, which incorporates a proprietary switched-capacitor notch filter to eliminate chopping noise and provide very low input-voltage noise of 50 nV/√Hz. The device features a versatile three-op-amp architecture to simplify design and reduce board space. The amplifier is housed in an MSOP-8 package, while a DFN-8 package will be available in the third quarter of 2008. (From $1.80 ea/1,000 — available now.)

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