Zero-drift amp consumes nanoamps

-December 22, 2017

Along with a supply current of just 650 nA, the LPV821 op amp from Texas Instruments offers optimized offset, drift, and 1/f noise performance. Zero-drift technology delivers a low initial offset of 10 µV and an offset drift of 0.02 µV/°C, eliminating temperature drift and flicker noise to enable the amplifier to attain high DC precision and dynamic error correction.

The nanopower consumption of the single-channel LPV821 makes the device suitable for always-on applications, such as continuous and blood-glucose monitoring. It can also be used in wireless sensing nodes, home and factory automation equipment, and portable electronics. Low supply current decreases the external circuitry required to turn the amplifier on and off. In addition, an input bias current of ±7 pA and low flicker noise of 3.9 µV pk-pk permits operation with high-impedance sensors for accurate measurements in precision systems.

Operating from a single supply voltage as low as 1.7 V, the LPV821 ensures continuous performance in low battery situations over a temperature range of -40°C to +125°C. The op amp can be paired with the TLV3691 nanopower comparator or ADS7142 nanopower ADC to program a threshold that will automatically wake up to microcontroller to further reduce system power consumption.

Prices for the LPV821 op amp in a 5-pin SOT-23 package start at $0.80 each in lots of 1000 units.

LPV821 product page

Texas Instruments, www.ti.com

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