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stm32f4discovery odd ADC behaviour

Question asked by zilberman.ilya on Sep 18, 2013
Latest reply on Sep 20, 2013 by zilberman.ilya
Hello guys, unfortunately I observe  very odd behavior with ADC on the Discovery board. In my hardware setup i have only a power supply to generate the voltage for ADC and I have soldered a 2.2nF capacitor on the input pin to minimize the interference. I reproduce this behavior also with ADC DMA example from stm32f4discovery firmware package. So I suppose there should not be a software problem. I observe high interference at ADC values 256, 512, 768, 1024 and so on, altogether 16 points. At these points my value jumps 256 values up and down. What is wrong?

Thank you in advance,