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Regarding ADC error

Question asked by Kye-Hyun Park on Nov 27, 2017
Latest reply on Nov 28, 2017 by Kye-Hyun Park

Dear all.


I measured ACD input increasing the voltage by 10mVdc. but, there are non-nonlinear points.

As the datasheet, ED and EL are +-1.5LSB and +_2LSB. It seems that my measurement result is bigger than them.

Could you please explain how to reduce the error?

Thank you in advance.


Vref : 3.3V

ADC clock : 72Mhz / 2 = 36Mhz

1 LSB : 3.3V / 4096 = 0.805664063

ADC channel : Fast channel ADC1 3channel

Sampling mode : Single-ended

Sampling time : ADC_SampleTime_7Cycles5