Nanopower operational amplifier maximises battery and sensor life

25th November 2016
Posted By : Anna Flockett
Nanopower operational amplifier maximises battery and sensor life

The industry’s first precision nanopower operational amplifiers (op amps) have been introduced by Texas Instruments (TI). The LPV811 and LPV812 consume quiescent current as low as 320nA and are part of a family of four new ultra-low-power op amps. Up to 60% lower power consumption than competitive precision op amps and offset voltage as low as 300µV, the new family of op amps extends battery and sensor life for applications such as building automation, wired and wireless sensor nodes, and wearables.

Some key features of the LPV811 include low power consumptions, with quiescent current without the use of duty cycling;these nanopower op amps enable more energy-efficient 4-20mA loop systems, extend battery life and reduce battery replacement costs.

The LPV811 family also includes high precision, with a low precision offset voltage and nanopower current consumption, the LPV811 and LPV812 help detect low concentrations of environmental gases and increase two-lead electrochemical sensor life and sensitivity.

Low-voltage operations with a single-supply voltage as low as 1.6V, the general-purpose LPV801 and LPV802 and precision LPV811 and LPV812 maintain continuous performance under low-voltage battery conditions.

Additionally high electromagnetic interference (EMI) immunity with an input rejection ratio greater than80dB in the 500MHz to 1GHz frequency range reduces the need for external filtering components, saves design time for EMI-sensitive applications and enables rapid system qualification according to international standards organisations.

The LPV811 family of amplifiers can drive the ADS7042 successive approximation register (SAR) analogue-to-digital converter, helping to deliver an ultra-low-power analogue front end.

The low power carbon monoxide sensor with over ten years coin cell battery life reference design demonstrates how the LPV811 nanopower op amp and the CC2650 SimpleLink multi-standard wireless microcontroller (MCU) reduce power consumption and extend the battery life of carbon monoxide gas detectors to as long as ten years and extend their sensing range up to 1,000 parts per million.

Designers also have access to a full suite of online support resources, including a complete library of TI Designs and SPICE models.

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