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ADUC7061 ADC

Thread Summary

The user observed that changes in the analog signal on ADC channel 1 affected samples on channel 2 in single-ended mode. The final answer suggests checking for noise in the negative end of the ADC input (ADC5) and requests details on the signal source and connections. The accompanying answer confirms the issue occurs with both primary and auxiliary ADCs.
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Hi

My customer used ADC channel 1, channel 2 and primary ADC to sample. When the analog signal applied to channel 1 changed, the samples on channel 2 also have been changed. The signal is single-ended. 

Why did it happen? How to eliminate the interactive influence between channels?