I need to sample an analog pressure sensor (TSCDRRN015PDUCV) with very high accuracy. The pressure sensor is currently connected to an instrumentation amplifier (AD623) and then sampled by my MCU's ADC. The sampling frequency is very low, something like 20-30 Hz.
I want to be sure to reject as much noise as I can. Does it make sense to add a first-order passive/active low-pass filter to get rid of HF noise between the sensor and the amplifier? If yes, what would you suggest as a cut-off frequency? Could it be something like 40 kHz, for example?
Is it also worth it adding a buffer between the instrumentation amplifier and the ADC?