LMP7312_14 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output

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
FEATURES
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•2 Typical Values, T_A = 25°C, V⁺=5V, V^-=0V.
• Gain Bandwidth 1 MHz
• Input Voltage Range (G= 0.096 V/V) -15V to
+15V
• Core Op-Amp Input Offset Voltage 100 µV
(Max)
• Supply Current 2 mA (Max)
• Gain (Attenuation Mode) 0.096 V/V, 0.192
V/V0.384 V/V, 0.768 V/V
• Gain (Amplification Mode) 1 V/V, 2 V/V
• Gain Error 0.035% (Max)
• Core Op-Amp PSRR 90 dB (Min)
• CMRR 80 dB (min)
• Adjustable Output Common Mode 1V to 4V
• Temperature Range −40 to 125°C
• Package 14-Pin SOIC
APPLICATIONS
• 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
DESCRIPTION
The LMP7312 is a digitally programmable variable
gain amplifier/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 modules 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 error. It can also be configured to handle
single ended input data converters by means of the
V_OCM pin (see Application Section for details). The
inputs of LMP7312 can be configured in attenuation
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 ensured 0.035% maximum
gain error (for all gains) and a maximum gain drift of
5ppm over the extended industrial temperature range
(-40° to 125°C) make the LMP7312 very attractive for
high precision systems even under harsh conditions.
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.
1
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2
PRODUCTION DATA information is current as of publication date.
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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