Zero-drift, nanopower amplifier reduces system power to maximise battery

Combining high precision with what is claimed to be the industry’s lowest supply current, the LPV821 has been released by Texas Instruments.

The zero-drift, nano power op amp has, says the company, exceptional power-to-precision performance. It enables engineers to attain the highest DC precision, while consuming 60 per cent less power than competitive zero-drift devices. The LPV821 is designed for use in precision applications such as wireless sensing nodes, home and factory automation equipment, and portable electronics.

The LPV821 op amp consumes just nA of supply current, while providing the high-precision benefits of optimised offset, drift and 1/f noise (flicker noise). This makes it suitable for applications where both precision and low power are essential system needs, including industrial gas detectors, field transmitters and battery packs.

It has a supply current of 650nA to extend battery lifetimes and enable lower power budgets in precision systems compared to competing zero-drift devices.

TI’s zero-drift technology delivers a low initial offset of 10-microV and an offset drift of 0.02-microV/degree C, eliminating temperature drift and flicker noise. This feature also enables engineers to attain the highest DC precision and dynamic error correction, says TI. Additionally, self-calibration technology helps engineers save system development cost and speed time to market.

There is no duty cycling. Nanopower consumption enables always-on applications such as continuous and blood glucose monitoring, and other electrochemical cell applications. Additionally, the low supply current decreases the external circuitry required to turn the amplifier on and off.

An input bias current of 7.0pA and low flicker noise at 3.9-microV peak to peak enables operation with high-impedance sensors, delivering more accurate measurements in precision systems.

Engineers can pair the LPV821 op amp with the TLV3691 nanopower comparator or ADS7142 nanopower ADC to program a threshold that will automatically wake up a microcontroller (MCU) such as the CC1310 SimpleLink Sub-1GHz microcontroller to further reduce system power consumption.

To simulate designs and predict circuit behavior using the LPV821 op amp, TI offers the TINA-TI Sice model for download. TI also offers the Always-On Low-Power Gas Sensing with 10+ Year Coin Cell Battery Life and Micropower Electrochemical Gas Sensor Amplifier reference designs. Electronic News – Latest News and Advice Electronic News is unlike any other website currently serving the electronics industry, with the very latest news for buyers and purchasers…
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