I'm considering using the MPX4115 absolute pressure sensor for altitude, and the MPXV5004DP differential sensor for speed. These are both 5V parts, and my microcontroller is 3.3V. What would be the optimal way to connect these sensors to my uC's ADC inputs?
Would a voltage divider suffice? What if I were to put an RC filter on the output of the pressure sensors (as suggested in the application note (http://www.freescale.com/files/sensors/doc/app_note/AN1646.pdf
) ? Should I buffer the output of the RC filter with an opamp, then use a resistor network to scale the voltage down to 3.3V? Or just put a resistor network immediately after the RC filter and tap the output to the ADC?