A new nano-power op amp from STMicroelectronics featuring a tiny 1.2mm x 1.3mm outline and typical current of only 900nA, is said to help cut the size and energy needs of analog circuits to the bare minimum. These devices include medical monitors, wearable electronics, gas detectors, pH sensors, infrared motion sensors, and payment tags.
ST claims that it would take over 25 years to discharge a 220mAh CR2032 cell with the TSU111 owing to its extremely low operating current. The op amp can therefore be designed-in with negligible impact on overall system energy management.
Also, the TSU111 features an input-offset voltage of 150uV and 0.1-10Hz noise of 3.6µVp-p that ensure high accuracy in signal-conditioning circuits.
In addition, the superior gain-bandwidth product (GBWP) of 11.5kHz and the rail-to-rail input stage enable monitoring of environmental or biological signals. The very low input bias current of 10pA helps minimize the effects of parasitic currents in sensing devices like gas detectors or photodiodes.
The supply-voltage range of 1.5V to 5V allows the op-amp to be powered from the same supply rail as logic circuitry thereby simplifying power-supply design and board layout. Moreover, the low minimum voltage 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, according to the firm.
The TSU111 is available in the 1.2mm x 1.3mm DFN6 package or 2mm x 2.1mm SC70-5 (SOT323-5), priced from $0.69 for orders of 1000 pieces.
For further information, click here.