we are using LPC4370 and capturing differential signal at 2x ADC channels. MCU is configured for maximum speed - 204MHz. ADc is configured for 80 MHz.
We found, that we have correlation between signals, see picture below:
As you can see - that is not an issue of analog front end for sure. We are using DMA, so i dont think that it is an issue with SW. Also we have found, that in case, when ADC is configured for 10MHz - issue is absent:
Does anybody knows, why we have such kind of issue and how to solve it?
We have tried to connect 1k resistor in parallel with ADC input - to discharge ADC - no result.