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Low-Power, Zero-Drift, Ultra-High-Precision Op Amp

Texas Instruments (TI) today introduced the first operational amplifier (op amp) to combine ultra-high precision with the industry's lowest supply current. With exceptional power-to-precision performance, the LPV821 zero-drift, nanopower op amp enables engineers to attain the highest dc precision, while consuming 60 percent 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.

Key features and benefits of the LPV821 op amp:

  • Exceptional power-to-precision performance: Consuming only nanoamps of supply current, while providing the high-precision benefits of optimized offset, drift and 1/f noise (flicker noise), the LPV821 is extremely beneficial for applications where both precision and low power are essential system needs, including industrial gas detectors, field transmitters and battery packs.
  • Sixty percent lower power consumption: With best-in-class supply current of 650nA, the LPV821 extends battery lifetimes and enables lower power budgets in precision systems than competitive zero-drift devices.
  • High dc precision: TI's zero-drift technology delivers a low initial offset of 10µV and an offset drift of 0.02µV/°C, eliminating temperature drift and flicker noise, and enabling engineers to attain the highest dc precision and dynamic error correction. Additionally, self-calibration technology helps engineers save system development cost and speed time to market.
  • 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.
  • High-impedance sensor operation: An input bias current of 7pA and low flicker noise at 3.9 Vp-p enables operation with high-impedance sensors, delivering more accurate measurements in precision systems.

Pre-production samples of the LPV821 op amp are now available through the TI store and authorized distributors in a 5-pin small-outline transistor (SOT-23) package. Pricing starts at US$0.80 in 1,000-unit quantities.