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    One of the ADC channel is noisy


      I have a delta sigma ADC connected to mux for sampling three signals. I get two signals correctly but the third signal channel seems to be quite noisy. Below i have attached an image showing the ADC reading. The reading in red color is third channel and is more noisy than others. All channels are differential and connected to  pins from 4[2] to 4[7].  ADC conversion rate is 42000sps.

      Is there any suggestion how to reduce the noise in third channel? Why there is noise more in one channel compare to other channels?

      Also some times i get glitch in all the channels. What could be the reason for it? An image of glitches is also attached below.



      Thank you.

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