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LMP7312
www.ti.com
SNOSB32B –MARCH 2010–REVISED MARCH 2013
LMP7312 Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output
Check for Samples: LMP7312
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FEATURES
DESCRIPTION
The LMP7312 is a digitally programmable variable
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• Typical Values, T
A
= 25°C, V
+
=5V, V
-
=0V.
gain amplifier/attenuator. Its wide input voltage range
• Gain Bandwidth 1 MHz
and superior precision make it a prime choice for
• Input Voltage Range (G= 0.096 V/V) -15V to
applications requiring high accuracy such as data
+15V
acquisition systems for IO modules in programmable
logic control (PLC). The LMP7312 provides a
• Core Op-Amp Input Offset Voltage 100 µV
differential output to maximize dynamic range and
(Max)
signal to noise ratio, thereby reducing the overall
• Supply Current 2 mA (Max)
system error. It can also be configured to handle
• Gain (Attenuation Mode) 0.096 V/V, 0.192
single ended input data converters by means of the
V
OCM
pin (see Application Section for details). The
V/V0.384 V/V, 0.768 V/V
inputs of LMP7312 can be configured in attenuation
• Gain (Amplification Mode) 1 V/V, 2 V/V
mode to handle large input signals of up to +/- 15V,
• Gain Error 0.035% (Max)
as well as in amplification mode to handle current
• Core Op-Amp PSRR 90 dB (Min) loops of 0-20mA and 4-20mA.The LMP7312 is
equipped with a null switch to evaluate the offset of
• CMRR 80 dB (min)
the internal amplifier. A ensured 0.035% maximum
• Adjustable Output Common Mode 1V to 4V
gain error (for all gains) and a maximum gain drift of
• Temperature Range −40 to 125°C
5ppm over the extended industrial temperature range
(-40° to 125°C) make the LMP7312 very attractive for
• Package 14-Pin SOIC
high precision systems even under harsh conditions.
A low input offset voltage of 100µV and low voltage
APPLICATIONS
noise of 3µVpp give the LMP7312 a superior
• Signal Conditioning AFE
performance. The LMP7312 is fully specified from -
40° to 125°C and is available in SOIC-14 package.
– ±10V; ±5V; 0-5V; 0-10V; 0-20mA; 4-20mA
• Data Acquisition Systems
• Motor Control
• Instrument and Process Control
• Remote Sensing
• Programmable Automation Control
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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