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TI touts lowest power zero-crossover op amp

Posted: 30 Aug 2007     Print Version  Bookmark and Share

Keywords:zero-crossover  rail-to-rail applications  CMOS process technology 

Texas Instruments Inc. has introduced what it claims as 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 utilises TI?s 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 analogue 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 outstanding offset voltage of 750?V over the entire rail-to-rail input range and a common-mode rejection ratio of 100dB minimum, thereby maximising 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 to 10Hz)

The OPA369 offers the precision, low power and small packaging required in a wide variety of applications such as portable medical devices (glucose meters, oxygen metering), portable instrumentation (gas detection/monitoring, handheld test equipment), sensor signal conditioning and portable consumer device. The OPA369 is also optimised to work with TI's MSP430 ultra-low-power microcontroller family.

"The OPA369 combines precision performance with low power, small packaging and low operating voltages to simplify high-performance designs in battery-powered, portable applications. Our customers will greatly benefit from this as it will help them to overcome design complexities while simultaneously delivering enhanced performance", said Apoorva Awasthy, business development manager, High Performance Analog (HPA), Texas Instruments India.

The dual OPA2369 is available now in SOT23-8 and MSOP-8 packages. Suggested resale pricing for the OPA2369 starts at Rs.48.54 ($1.20) in 1,000-piece quantities.

The single OPA369 is sampling now, with volume production scheduled for 4Q 2007. The device is available in an SC70-5 package and suggested resale pricing starts at Rs.32.36 ($0.80) in 1,000-piece quantities. In addition, TINA-TI SPICE-based analogue simulation software is available for easy-to-use circuit simulation.

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