LMP7312 Precision SPI-Programmable AFE

Texas Instruments' 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 V_OCM pin. The inputs of LMP7312 can be configured in attenuation mode to handle large input signals of up to ±15 V as well as in amplification mode to handle current loops of 0 to 20 mA and 4 mA to 20 mA. 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 5 ppm 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 100 µV and low voltage noise of 3 µV_PP 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.