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ADC conversion is not stable

Question asked by Fabio Malatesta on Oct 10, 2017
Latest reply on Oct 13, 2017 by Fabio Malatesta

Hello!
I'm using XPC56xL minimodule on the XPC56XX motherboard.
I slightly modified the SPC56ELxx OS-Less ADC Test Application to print the ADC conversion values on the UART
The issue I noticed is that the value of the conversion is not stable: for example if I print 15 measures (all of them done without changing the trimmer position) I get the following result (in hexadecimal):

 

ADC Value:
278
279
274
278
277
274
272
272
275
278
276
274
276
276
278
276

 

So it seems that the 4 least significant bits are given only by the noise. Since i read on the reference manual that the ADC has 12 bits resolution, i would like to know if there is a strategy to keep those bits stable.

Thank you in advance!

kind regards,
Fabio

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