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LMP7312MA Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMP7312MA Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LMP7312 June 18, 2010 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 OCM pin (see application section 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. Features 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/V 0.384 V/V, 0.768 V/V ■ Gain (AmplificationMode) 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 Typical Application 30075513 LMP™ is a trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation 300755 www.national.com |
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