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Low-noise amps deliver high accuracy for sensors

Posted: 14 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:op amp? sensor? interface?

National Semiconductor has launched the LMP2021 and LMP2022 zero-drift op amps highlighting low input voltage noise11nV/Hz at a gain of 1,000V/Vand high DC accuracy for instrumentation and sensor interface applications.

With these devices, they are believed to be the first devices to enable the performance advantages of zero-drift amplifiers that will be employed in applications that need high gain and low sub-15nV/Hz noise.

Key specifications are 0.004?V/C of input offset voltage drift (TCVOS), with a typical VOS of 0.4?V. Both devices work from 2.2V to 5.5V and have a gain bandwidth of 5MHz while using only 1.1mA per channel. Operating temperature range is from -40C to 125C.

Continuous-correction circuitry auto zeroes the input offset error voltage, allowing uninterrupted accuracy over time and temperature, with high common-mode rejection ratio and power supply rejection ratio, as well as removal of the 1/f voltage error component. Integrated EMI suppression filters provide an EMI rejection ratio of 79dB.

The single LMP2021 is supplied in 5-pin SOT23 and 8-pin small outline IC packages (SOIC), and the dual LMP2022 is supplied in 8-pin SOIC and 8-pin mini small outline packages.

- Rich Pell
Industrial Control Designline

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