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National Semi's new amps meet current sensing requirements

Posted: 11 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? precision amplifier? lmp8275? lmp8277? lmp8276?

high-performance precision amplifier

National Semiconductor Corp. expanded its high-performance precision amplifier offering with three high common-mode difference amplifiers that were designed for broad-based industrial, medical and telecom applications.

These new amplifiers are said to meet the requirements for accurate current sensing measurements in base stations, notebook PCs and sensor controls in industrial applications.

The LMP8275 and LMP8277 high common-mode amplifiers and LMP8276 high common-mode bidirectional amplifier join National's linear monolithic precision (LMP) product family, which detects, amplifies and filters small differential signals in the presence of high common-mode voltages.

"Each of the new amplifiers is individually tested at three separate temperatures to ensure we meet the demanding requirements for industrial, medical and telecom applications with very low offset voltage and drift," said Erroll Dietz, VP of National's Amplifier product group.

The LMP8275/6/7 are fixed-gain differential amplifiers with a -2V to 27V input common-mode voltage range and a supply voltage range of 4.75V to 5.5V.

The amplifiers' guaranteed tri-temperature testing ensures a low temperature coefficient for offset voltage drift.

The gain of the LMP8275 and LMP8276 is fixed at 20, allowing them to amplify small signals and drive analog-to-digital converters (ADCs) to full scale. The LMP8277's gain is fixed at 14.

The guaranteed wide common-mode voltage range (CMVR) of -2V to 27V provides design flexibility. An extended CMVR of -2V to 36V is also specified for these three products.

The very low offset voltage (less than 2mV) and offset drift (less than 30?V/C) of these products allow for accurate differential signal conditioning of small signals, with minimal voltage offset error through the entire temperature range.

Additionally, the extended operating temperature range of -40C to 125C ensures these amplifiers can be used in extreme conditions, such as those found in industrial applications. The amplifiers are available in SOIC-8 packaging. The LMP8275 and LMP8277 are priced at $1.05 each and the LMP8276 is priced at $1.15 each, all in 1,000-unit quantities.

- Bettyann Liotta

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