TI unveils power zero-crossover op amp for portable applications

DALLAS, USA: Texas Instruments Inc. (TI) has introduced the power zero-crossover operational amplifier (op amp). 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 1uA 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 1uA single-supply amplifiers," said Art George, senior vice president 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 outstanding offset voltage of 750uV over the entire rail-to-rail input range and a common-mode rejection ratio (CMRR) of 100dB minimum, thereby maximizing the useable input dynamic range for low supply voltage applications. Other features include low noise of 120nV/rtHz, gain bandwidth of 12kHz on 1uA, low input bias current of 50pA maximum, low voltage offset drift of 1.75uV/C (max), PSRR of 94dB and low 1/f noise of 3.6uVp-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 devices.

TI provides customers with a state-of-the-art signal chain solution for portable applications: analog-to-digital converters such as the ADS1100; digital-to-analog converters such as the DAC8811; and precision voltage references such as the REF33xx. The OPA369 is also optimized to work with TI's MSP430 ultra-low-power microcontroller family.