I am connecting a voltage source directly to the analog input, reading with a voltmeter and the arduino simultaneously, and comparing values. I have a lot of noise and offset on the readings with my arduino Due. Up to 10% error. I am attaching two files: one with the error relative to input voltage and other with the transfer function. Is this error normal?
I would like to try a different ADC to see if I can improve my readings. I would like at least a 12bit and 200kSPS ADC.
Can anyone recommend a model that I can easily attach to the DUe?
Are all ADCs that have SPI interface compatible with the Due? (I have only found examples for certain models and none meet my requirements)