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Programmable gain amp touts 0.03% gain accuracy

Posted: 01 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:programmable gain amplifier? sensor interface applications? thin-film resistors? operational amplifier?

National Semiconductor Corp. claims that its LMP8100A programmable gain amplifier (PGA) enables a new level of signal conditioning performance in sensor interface applications and DAQ systems targeting the industrial and instrumentation markets. LMP8100A delivers guaranteed 0.03 percent gain accuracy using a software adjustable gain (in 1V/V increments) from 1V/V to 16V/V over the full industrial temperature range of -40C to 125C.

National also offers the LMP8100 semi-precision grade PGA, which provides guaranteed 0.075 percent gain accuracy over the -40C to 85C temperature rage. The amplifiers closed-loop gain is set by an array of 16 precision thin-film resistors. At the core of the PGAs is a precision 33MHz CMOS input, rail-to-rail, I/O (RRIO) operational amplifier with a typical open-loop gain of 110dB.

LMP8100A provides a slew rate of 12V/?s and a 33MHz unity-gain bandwidth. The device's supply voltage range is 2.7-5.5 V, with a 5.3mA supply current and output current of 20mA. A power-conserving shutdown mode reduces current consumption to 20?A.

Available in 14-pin SOIC packages, LMP8100A is priced at $7 and the LMP8100 is priced at $2.50, both in quantities of 1,000.

- Gina Roos

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