Op Amps Exhibit Low Input Noise
Included in the WEBENCH Sensor Designer Tool, National Semiconductor’s LMP2021 (single) and LMP2022 (dual) zero-drift operational amplifiers present an input voltage noise of 11 nV/sqrt Hz at a gain of 1,000 V/V. The components use EMI suppression filters, demonstrate an EMI rejection ratio (EMIRR) of 79 dB, support 24-bit data acquisition systems, and optimally drive the ADC161S626 16-bit ADCs. The products offer input offset voltage drift of 0.004 uV/°C at a typical offset voltage of 0.4 uV, a gain bandwidth of 5 MHz, current consumption of 1.1 mA per channel, open loop gain of 160 dB, CMRR exceeding 139 dB, and PSRR exceeding 130 dB. The devices operate across a supply voltage range from 2.2 V to 5.5 V over a temperature range from -40°C to 125°C. Pricing is $1.35 and $1.90, respectively, each in 1,000 quantities.