LMP8358 Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – Zero-Drift, Programmable Instrumentation Amplifier with Diagnostics

LMP8358
May 5, 2010
Zero-Drift, Programmable Instrumentation Amplifier with
Diagnostics
General Description
The LMP8358 is a precision programmable-gain instrumen-
tation amplifier in National's LMP^® precision amplifier family.
Its gain can be programmed to 10, 20, 50, 100, 200, 500, or
1000 through an SPI-compatible serial interface or through a
parallel interface. Alternatively, its gain can be set to an arbi-
trary value using two external resistors. The LMP8358 uses
patented techniques to measure and continuously correct its
input offset voltage, eliminating offset drift over time and tem-
perature and the effect of 1/f noise. Its ground-sensing CMOS
input features a high CMRR and low input bias currents. It is
capable of sensing differential input voltages in a common-
mode range that extends from 100mV below the negative
supply to 1.4V below the positive supply, making it an ideal
solution for interfacing with ground-referenced sensors, sup-
ply-referenced sensor bridges, and any other application re-
quiring precision and long-term stability. Additionally, the
LMP8358 includes fault detection circuitry to detect open and
shorted inputs and deteriorating connections to the signal
source. Other features that make the LMP8358 a versatile
solution for many applications are its rail-to-rail output, low
input voltage noise and high gain-bandwidth product.
Features
Typical Values unless otherwise noted, T_A = 25°C
■ ^{Supply voltage}
2.7V to 5.5V
■ ^{Supply current}
1.8 mA
■ ^{Max gain error}
0.15%
■ ^{Max gain drift}
16 ppm/°C
■ ^{Min CMRR}
110 dB
■ ^{Max offset voltage}
10 µV
■ ^{Max offset voltage drift}
50 nV/°C
■ ^{GBW (gain = 10)}
8 MHz
■ ^{Max non-linearity}
100 ppm
■ ^{Operating temperature range}
−40°C to 125°C
■ ^{Input fault detection}
■ ^{SPI or pin configurable modes}
■ ^{EMIRR at 1.8GHz}
92 dB
■ ^{14-Pin SOIC and 14-Pin TSSOP Package}
Applications
■ ^{Bridge sensor amplifier}
■ ^{Thermopile amplifier}
■ ^{Portable instrumentation}
■ ^{Medical instrumentation}
■ ^{Precision low-side current sensing}
Typical Application
LMP^® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 300454
300454g1
www.national.com