Using NOP912/NOP914 for precision measurement applications
To measure a small signal, if the signal is too small, users need to amplify the signal and then sample it with a microcontroller. At this time, you need to use operational amplifiers.
Operational amplifiers play a significant role in precision measurement applications, responsible for amplifying or filtering the signal. The main factors affecting measurement results include input offset voltage, temperature drift, etc.
The input offset voltage affects the overall system precision. An operational amplifier whose input offset voltage is not low enough will cancel out the input signal. Users need to use software to compensate, and if the input offset voltage is much larger than the input signal, the software to compensate does not work. Therefore, in precision measurement applications, it is recommended to use the NOP912/NOP914 series, which features a low offset voltage of 50 µV to improve the overall system precision.
The temperature drift is input offset voltage drift when the temperature changes. For industrial applications, environment temperature varies greatly, which will cause errors in the output of operational amplifiers. In severe cases, you may need a temperature sensor to compensate for it. Thus, you must choose a low-temperature drift operational amplifier in precision measurement applications. It is recommended to use the NOP912/NOP914 series, which features a low-temperature drift of 0.05 µV/℃ to guarantee output precision even in an environment with large temperature changes.