Zero-crossover, rail-to-rail amplifier

A Texas Instruments (April 2006-) product story

Edited by the Electronicstalk editorial team Jul 27, 2006

TI unveils zero-crossover, rail-to-rail amplifier for high-performance, single-supply applications

Texas Instruments Incorporated has introduced a precision operational amplifier that utilises an innovative zero-crossover, single-input stage architecture to achieve glitchless rail-to-rail performance.

Featuring ultra-low distortion of 0.0006% THD+N, low noise of 4.5nV/rtHz and gain bandwidth of 50MHz, the OPA365 is ideal for a wide variety of single-supply applications found in portable instrumentation, data acquisition, test and measurement, audio and portable medical systems.

"The OPA365 exploits TI's expertise in analog signal conditioning to solve the common design challenge of finding an op amp that does not limit the capability of the data convertor," said Art George, senior vice president of TI's high-performance analog business.

"The OPA365's zero-crossover topology, combined with superior noise and speed performance, solves this design challenge unlike any other amplifier on the market and reinforces TI's position as the leading supplier of high-performance amplifiers".

The unique single-stage input topology enables rail-to-rail input without the crossover associated with traditional complementary input stages.

This design reduces distortion and delivers outstanding common-mode rejection ratio (CMRR) of 100dB minimum and 120dB typical over the entire input range (100mV beyond the supply rails), making it ideal for driving analog-to-digital convertors without degradation of differential linearity.

Other features include fast settling time of 300ns to 0.01%, low offset voltage of 200uV maximum and single-supply operation from 2.2V to 5.5V.

TI provides customers with a state-of-the-art signal chain solution for precision applications: analog-to-digital convertors such as ADS8327, ADS8361, ADS7886; digital-to-analog convertors such as DAC8811, DAC8830; and precision voltage references such as REF32xx.

The OPA365 is also optimised to work with TI's high-performance TMS320T DSP platforms.

A dual version, OPA2365, will be available in DFN-8 and SO-8 packages in 3Q 2006.

All devices are specified for operation from -40C to +125C.