Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LMP8100A
Edited by the Electronicstalk Editorial Team on 01 August 2007
Programmable gain amp claims top
precision
PGA delivers guaranteed 0.03% gain accuracy using a software adjustable gain from 1V/V to 16V/V over the full industrial temperature range of -40 to +125C.
National Semiconductor is claiming the industry's highest-precision programmable gain amplifier (PGA), enabling a new level of signal-conditioning performance in sensor interface applications and data acquisition systems targeting the industrial and instrumentation markets National's LMP8100A delivers guaranteed 0.03% gain accuracy using a software adjustable gain (in 1V/V increments) from 1V/V to 16V/V over the full industrial temperature range of -40 to +125C
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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National also offers the LMP8100 semiprecision grade PGA, which provides guaranteed 0.075% gain accuracy over the -40 to +85C temperature range.
The amplifier's 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, input/output (RRIO) operational amplifier with a typical open-loop gain of 110dB.
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Many instrumentation products require the designer to scale the output of a sensor to the full-scale input of an analogue-to-digital convertor (ADC) to ensure optimal sensitivity.
National offers this analogue signal-path solution for instrumentation products by combining the LMP8100A with a 1Msample/s, 12bit, one-channel ADC - such as the ADC121S021, ADC121S051 or ADC121S101.
The LMP8100A provides four levels of internal frequency compensation, which at the higher gain settings increases the usable signal bandwidth.
Its input zero calibration feature allows the user to measure the output offset voltage to calibrate any errors resulting from temperature or voltage shifts.
The amplifier's control modes are programmed via a serial port that also allows several devices to be cascaded, permitting an array of LMP8100 amplifiers to be programmed by a single microcontroller serial data stream.
The device's control-mode registers are double-buffered to ensure glitch-free transitions between programmed settings.
The LMP8100A has a slew rate of 12V/us and a 33MHz unity-gain bandwidth.
The device's supply voltage range is 2.7 to 5.5V, with a 5.3mA supply current and output current of 20mA.
A power-conserving shutdown mode reduces current consumption to 20uA.
Built on National's proprietary VIP50 BiCMOS process technology, the LMP8100A and LMP8100 are the latest additions to the company's LMP precision and low-voltage, low-power amplifier families.
These amplifiers dramatically improve system accuracy and power consumption.
The LMP8100A and LMP8100 are available now in 14-pin SOIC packages.
The LMP8100A is priced at US $7 and the LMP8100 is priced at $2.50, both in 1000-unit quantities.
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