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Correlation between 2xADC channels at LPC4370

Question asked by Sergii Makovetskyi on May 14, 2019
Latest reply on May 16, 2019 by xiangjun.rong


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.