I want to measure +/- 62.5 pascal (+/- 0.25 inch H2O) from MPXV7002DP sensor. How can i accomplish that with good repeatability ?
From what i see in the datasheet, it gives 2500mV at 0 pascal, and +/- 1mV per pascal on the positive or negative side.
I am assuming to follow these steps :
1) Using a Differential amplifier, subtract 2437.5 mV from the output signal of MPVX7002DP, this will result in 0mV at -62.5 pascal differential pressure - AND also result in 125 mV at +62.5 pascal Diff. Pressure.
2) Add a gain stage of x24, so the resultant max 125mV will become 3000mV, which is the upper range of my ADC.
However, my problems are :
A) Is this the right approach ?
B) how do i generate a precise reference of 2437.5 mV for the differential amplifier ?
C) The graph of output voltage from the sensor shows different slopes at different temperatures. How do i accomodate for this in my design ?
Thanks for your help.