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Instrumentation amp touts lowest power, improved accuracy

Posted: 17 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:instrumentation amplifier? zero-drift? portable application?

Texas Instruments Inc. has launched what it claims to be the lowest power zero-drift instrumentation amplifier. The device claims to have the lowest quiescent current and lowest input bias current, as well as an impressive power-to-noise ratio, very low offset voltage/drift and 1.8V operation.

The INA333 improves accuracy and stability while extending battery life in a variety of precision, low-power applications such as portable medical, handheld instrumentation, weigh scales and data acquisition.

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 75?A of quiescent current and operation on power supplies as low as 1.8V, the INA333 maximizes power efficiency. Low offset voltage of 25?V and offset drift of 0.1?V/C also deliver high 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 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.

The INA333 joins TI's signal chain solution for precision, low-power applications: ADCs such as the ADS1158; operational amplifiers such as the OPA333; digital isolators such as the ISO721; and temperature sensors such as the TMP102. The INA333 is also optimized to work with TI's MSP430 ultra-low power MCU family.

"Customers are consistently demanding higher precision combined with lower power and lower operating voltages in order to increase the performance and value of their sensor signal acquisition systems," said Art George, senior VP of TI's high-performance analog business unit. "The INA333 leverages our expertise in analog signal conditioning to deliver a new standard for precision, low-power instrumentation amplifiers and enable our customers to gain a competitive advantage in the market."

The INA333 is available now from TI and its authorized distributors in an MSOP-8 package. A DFN-8 package will be available in Q3. Suggested resale pricing starts at $1.80 in 1,000-piece quantities. TINA-TI SPICE-based analog simulation software is also available for easy-to-use circuit simulation.

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