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LMP8100_08 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Programmable Gain Amplifier | |||
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April 18, 2008
LMP8100
Programmable Gain Amplifier
General Description
The LMP8100 programmable gain amplifier features an ad-
justable 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 cas-
caded so that an array of LMP8100 amplifiers can be pro-
grammed 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 includ-
ing: gain; a power-conserving shutdown mode which can
reduce current consumption to only 20 μA; an input zeroing
switch which allows the output offset voltage to be measured
to facilitate system calibration; and four levels of internal fre-
quency compensation which can be set to maximize band-
width at the different gain settings.
The LMP8100 comes in a 14-Pin SOIC package.
Features
Typical Values, TA = 25°C
â Gain error (over temperature range)
â LMP8100A
0.03%
â LMP8100
0.075%
â Gain range
1 to 16 V/V in 1 V/V steps
â Programmable frequency compensation
â Input zero calibration switch
â Input offset voltage (max, LMP8100A)
250 μV
â Input bias current
â Input noise voltage
0.1 pA
12 nV/âHz
â Unity gain bandwidth
33 MHz
â Slew rate
12 V/μs
â Output current
20 mA
â Supply voltage range
2.7V to 5.5V
â Supply current
5.3 mA
â Rail-to-Rail output swing
V+ â50 mV to Vâ +50 mV
Applications
â Industrial instrumentation
â Data acquisition systems
â Test equipment
â Scaling amplifier
â Gain control
â Sensor interface
Simplified Block Diagram
LMP® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 201476
20147607
www.national.com
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