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ADS8345: Why I get wrong data in first sampling cycle?

Part Number: ADS8345

Hi expert,

I am using ADS8345 but I always get wrong data at the first sampling cycle after power up ADC, and after the first cycle, every cycle sample data is good, even though I change channel by internal Mux.

Can you make me clear if it is necessary to discard the first sample after ADS8345 power up or not?

If yes, why the first sample need to discard?

If no need to discard first sample, what rules I should to comply with to make sure my first sample correct?

Thank you