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Instrumentation amplifier improves accuracy, extends battery life

Dallas, Tex. — Texas Instruments Inc. (TI) has claimed the industry's lowest power zero-drift instrumentation amplifier. The INA333 device is said to offer the lowest quiescent current and lowest input bias current versus the nearest competition, as well as an excellent power-to-noise ratio, very low offset voltage/drift and 1.8-V operation. 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 leverages 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 50 nV/rt-Hz. The device also features a three op-amp architecture to simplify design and reduce board space.

With only 75 uA of quiescent current and operation on power supplies as low as 1.8 V, the INA333 maximizes power efficiency. Low offset voltage of 25 uV and offset drift of 0.1 uV/°C deliver excellent accuracy and long-term stability. Applications with high impedance sources will benefit from low input bias current of 200 pA, TI said. The INA333 is optimized to work with TI's MSP430 ultra-low power microcontroller family.

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

Pricing: Suggested resale pricing starts at $1.80 in quantities of 1,000.
Availability: The INA333 is available now in a MSOP-8 package. A DFN-8 package will be available in third quarter 2008. TINA-TI SPICE-based analog simulation software is also available for circuit simulation.
Product information: INA333 and analog design support

Texas Instruments , 1-800-477-8924, www.ti.com

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