Somewhere I read that if noise is a possibility on the input of an ADC channel, it is a good idea to place an RC filter between the analog source and the MCU input.
I am using the KL25Z Freedom board. I think I read that there should be a .01 cap to ground and a (possibly?) 50 ohm or less resistor in series with the input.
Is this mentioned in the Freescale literature anywhere, and, if so, what values are recommended? Also, how might a 33 ohm resistor, for instance, affect the ADC timing?