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LMP7312 Precision SPI-Programmable AFE
with Differential/Single-Ended Input/Output


National Semiconductor's digitally-programmable variable gain amplifier/attenuator


National Semiconductor LMP7312 Amplifier/AttenuatorNational Semiconductor's LMP7312 has a wide input voltage range and superior precision that make it a prime choice. Its wide input voltage range and superior precision make it a prime choice for applications requiring high accuracy such as data acquisition systems for I/O 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 VOCM pin. 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 to 20mA and 4 to 20mA. The LMP7312 is equipped with a null switch to evaluate the offset of the internal amplifier. A guaranteed 0.035% maximum gain error (for all gains) and a maximum gain drift of 5ppm over the extended industrial temperature range (-40°C 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°C to 125°C and is available in an SOIC-14 package.


Features Applications
  • Typical values, TA = 25°C, V+=5V, V-=0V.
  • Gain bandwidth: 1MHz
  • Input voltage range (G= 0.096 V/V): -15V to +15V
  • Core op-amp input offset voltage: 100µV Max.
  • Supply current: 2mA Max.
  • Gain (attenuation mode):
    0.096V/V, 0.192V/V, 0.384V/V, 0.768V/V
  • Gain (amplification mode): 1V/V, 2V/V
  • Gain error: 0.035% Max.
  • Core op-amp PSRR: 90dB Min.
  • CMRR: 80dB Min.
  • Adjustable output common mode: 1V to 4V
  • Temperature range: -40°C to 125°C
  • Package: 14-pin SOIC
  • Signal conditioning AFE:
    ±10V; ±5V; 0V to 5V; 0V to 10V; 0mA to 20mA; 4mA to 20mA
  • Data acquisition systems
  • Motor control
  • Instrument and process control
  • Remote sensing
  • Programmable automation control
  • RoHS Compliant

Digi-Key P/N National Semi P/N Current - Supply Package Datasheet
LMP7312MA-ND LMP7312MA/NOPB 2mA 14-SOIC (3.9mm Width),
14-SOL
LMP7312 Datasheet