Nano-power op amp boosts sensing accuracy in small spaces

Able to reduce the size and energy requirements of analogue circuits in wearable devices, medical monitors, gas detectors, pH sensors, IR motion sensors and payment tags, the TSU111 nano-power amplifier consumes just 900nA. It is available in a package with a 1.2 x 1.3mm outline from STMicroelectronics.

The TSU111’s operating current is comparable with the leakage current of some low-cost capacitors, says the company, adding it would take over 25 years to discharge a 220mAh CR2032 cell.

It outperforms other nano-power op amps with its input-offset voltage of 150microV and 0.1 to 10Hz noise of 3.6microVp-p for high accuracy in signal-conditioning circuits.

Gain-bandwidth is 11.5kHz, while the rail-to-rail input stage monitors environmental or biological signals. The low input bias current of 10pA helps minimise the effects of parasitic currents in sensing devices like gas detectors or photodiodes.

With a supply voltage of 1.5 to 5.0V, the TSU111 can be powered from the same supply rail as logic circuitry to simplify power supply design and board layout. The low voltage also allows the device to run longer as the battery discharges, and simplifies use in equipment powered by energy-harvesting systems such as photovoltaic (PV) cells.

The TSU111 is available immediately in the 1.2 x 1.3mm DFN6 package or 2.0 x 2.1mm SC70-5 (SOT323-5).

http://wwww.st.com

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