Programmable Gain Amplifier
The LMP8100 Programmable Gain Amplifier features an adjustable gain from 1 to 16 V/V in 1 V/V increments. At the core of the LMP8100 is a precision, 33 MHz, CMOS input, Rail-to-Rail input/output Operational Amplifier with a typical open-loop gain of 110 dB. Amplifier closed-loop gain is set by an array of precision thin-film resistors. Amplifier control modes are programmed via a serial port that allows devices to be cascaded so that an array of LMP8100 Amplifiers CAN be programmed by a single serial data stream. The control mode Registers are double buffered to insure glitch-free transitions between programmed settings. The LMP8100 is part of the LMP Precision Amplifier family and is ideal for a variety of applications.
The Amplifier features several programmable controls including: gain; a power-conserving shutdown mode which CAN reduce current consumption to only 20 ?A; an input zeroing Switch which allows the output offset voltage to be measured to facilitate system calibration; and four levels of internal frequency compensation which CAN be set to maximize bandwidth at the different gain settings.
The LMP8100 comes in a 14-Pin SOIC package.
By National Semiconductor Corporation
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