lmp7312max National Semiconductor Corporation, lmp7312max Datasheet

lmp7312max

Manufacturer Part Number

lmp7312max

Description

Lmp7312 Precision Spi-programmable Afe With Differential/single-ended Input/output

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMP7312MAX.pdf (22 pages)

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Precision SPI-Programmable AFE with Differential/Single-

Ended Input/Output

General Description

The LMP7312 is a digitally programmable variable gain am-

plifier/attenuator. Its wide input voltage range and superior

precision make it a prime choice for applications requiring

high accuracy such as data acquisition systems for IO mod-

ules in programmable logic control (PLC). The LMP7312

provides a differential output to maximize dynamic range and

signal to noise ratio, thereby reducing the overall system er-

ror. It can also be configured to handle single ended input data

converters by means of the V

for details). The inputs of LMP7312 can be configured in at-

tenuation mode to handle large input signals of up to +/- 15V,

as well as in amplification mode to handle current loops of

0-20mA and 4-20mA.The LMP7312 is equipped with a null

switch to evaluate the offset of the internal amplifier. A guar-

anteed 0.035% maximum gain error (for all gains) and a

maximum gain drift of 5ppm over the extended industrial tem-

perature range (-40° to 125°C) make the LMP7312 very

attractive for high precision systems even under harsh con-

ditions. A low input offset voltage of 100µV and low voltage

noise of 3µVpp give the LMP7312 a superior performance.

The LMP7312 is fully specified from -40° to 125°C and is

available in SOIC-14 package.

Typical Application

LMP™ is a trademark of National Semiconductor Corporation.

OCM

pin (see application section

300755

LMP7312

Features

Typical Values, T

■

Applications

■

Gain bandwidth

Input voltage range (G= 0.096 V/V)

Core op-amp input offset voltage

Supply current

Gain (Attenuation Mode)

Gain (AmplificationMode)

Gain Error

Core op-amp PSRR

CMRR

Adjustable output common mode

Temperature range

Package

Signal conditioning AFE

±10V; ±5V; 0-5V; 0-10V; 0-20mA; 4-20mA

Data Acquisition systems

Motor control

Instrument and process control

Remote sensing

Programmable automation control

= 25°C, V

=5V, V

=0V.

0.096 V/V, 0.192 V/V

0.384 V/V, 0.768 V/V

June 18, 2010

0.035% (max)

www.national.com

100 µV (max)

30075513

-15V to +15V

−40 to 125°C

14-Pin SOIC

1 V/V, 2 V/V

2 mA (max)

90 dB (min)

80 dB (min)

1V to 4V

1 MHz

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