Precision nanopower op amps maximize battery and sensor life

November 10, 2016 // By Graham Prophet
Texas Instruments' precision nanopower operational amplifiers, LPV811 and LPV812, consume quiescent current as low as 320 nA and are part of a family of four new ultra-low-power op amps.

With up to 60% lower power consumption than alternative precision op amps and offset voltage as low as 300 µV, this family of op amps extends battery and sensor life for applications such as building automation, wired and wireless sensor nodes, and wearables.

The op amps enable more energy-efficient 4- to 20-mA loop systems, extend battery life and reduce battery replacement costs. Their offset voltage and nanopower current consumption help detect low concentrations of environmental gases and increase two-lead electrochemical sensor life and sensitivity. Operating with a single-supply voltage as low as 1.6 V, the general-purpose LPV801 and LPV802 and precision LPV811 and LPV812 maintain continuous performance under low-voltage battery conditions.

High electromagnetic interference (EMI) immunity comes with an input rejection ratio greater than 80 dB in the 500-MHz to 1-GHz frequency range, reducing the need for external filtering components, saving design time for EMI-sensitive applications and aiding system qualification. The LPV811 family of amplifiers can drive the ADS7042 successive approximation register (SAR) analog-to-digital converter, helping to deliver an ultra-low-power analogue front end.

 

The 'Low Power Carbon Monoxide Sensor with 10+ Year 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 10 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.

 

 





Product

Packaging

Pricing in 1,000-unit quantities

Op amp type

LPV801

5SOT-23

US$0.44

Single channel, general purpose

LPV802

8VSSOP

US$0.70

Dual channel, general purpose

LPV811

5SOT-23

US$0.68

Single channel, precision

LPV812

8VSSOP

US$0.95

Dual channel, precision

 

TI; www.ti.com/nanopower-pr-eu