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Precision op amp eases portable designs

Posted: 04 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:zero-crossover operational amplifier? op amp? rail-to-rail applications?


Texas Instruments Inc. has rolled out the what it claims to be the industry's lowest power zero-crossover operational amplifier. Featuring a unique single-input-stage architecture, the OPA369 achieves rail-to-rail performance without input crossover to solve the common design problem of input offset distortion due to the change in common mode voltage that is very prominent in low-voltage, rail-to-rail applications. Combined with 1?A quiescent current, SC70 package and operation down to 1.8V, the OPA369 simplifies high-performance designs in battery-powered, portable products.

"The OPA369 utilizes TI's innovative zero-crossover topology and next-generation CMOS process technology to offer precision performance previously unavailable in 1?A single-supply amplifiers," said Art George, senior VP of TI's high-performance analog business. "Typically, designers are forced to choose between power consumption and the AC or DC performance of their signal conditioning amplifiers. The OPA369 will enable customers to increase the precision in their portable applications without complicating the design or increasing their power budget."

The single-input stage architecture delivers an offset voltage of 750?V over the entire rail-to-rail input range and a common-mode rejection ratio (CMRR) of 100dB minimum, maximizing the useable input dynamic range for low supply voltage applications. Other features include low noise of 120nV/rtHz, gain bandwidth of 12kHz on 1?A, low input bias current of 50pA maximum, low voltage offset drift of 1.75?V/C (max), PSRR of 94dB and low 1/f noise of 3.6?Vp-p (0.1-10Hz)

The OPA369 offers the precision, low power and small packaging required in applications such as portable medical devices (glucose meters, oxygen metering), portable instrumentation (gas detection/monitoring, handheld test equipment), sensor signal conditioning and portable consumer devices.

The dual OPA2369 is available now from TI and its authorized distributors in SOT23-8 and MSOP-8 packages. Pricing for the OPA2369 starts at $1.20 in 1,000-piece quantities.

The single OPA369 is sampling now, with volume production scheduled in Q4. The device is available in an SC70-5 package and starts to sell at $0.80 in 1,000-piece quantities. In addition, TINA-TI SPICE-based analog simulation software is available for easy-to-use circuit simulation.

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