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Zero-drift op amp delivers low noise of 8.8nV/rtHz

Posted: 18 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:operational amplifier? zero-drift? high precision?

Texas Instruments Inc. (TI) has released what it claims to be the industry's first zero-drift, 36V operational amplifier (op amp). The OPA2188 delivers low noise of 8.8nV/rtHz for high system precision and provides 2MHz of bandwidth while consuming only 475uA of quiescent current, stated the company.

TI said the dual-channel OPA2188 provides 4x improvement in offset voltage drift compared to the competition, 60 percent enhancement in initial offset voltage and twice the bandwidth at the same power consumption. The device can be used in high- and low-voltage supply applications requiring ultra-high precision that include test and measurement equipment, electronic weigh scales, medical instrumentation and flow meters.

"The OPA2188 combines TI's proprietary zero-drift technology with our precision 36V processes, providing analog designers with a clean and simple way to solve the challenge of taking precision-level measurements in a high-voltage environment," said Steve Anderson, senior VP of TI's high performance analog business. "Our design teams have achieved leading performance levels for ultra-low noise, EMI and RFI input filtering, and low power consumption. These efforts will help our customers achieve higher efficiencies in applications like control and automation and higher accuracy in portable medical designs."

The op amp provides 0.03uV/C that reduces the need for future system calibration. It has an initial offset voltage of 25uV that enables the highest-resolution sensor measurement in its class, TI claimed. Its input common mode range also extends from negative rail to within 1.5V of the positive rail that saves additional circuitry and enables 5V single-supply operation.

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