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Signal jumping

Category: Hardware
Product Number: adg779

I am using adg779 for selecting two different 10mhz sources for auto detection.

When s1 (+4 dBm)is given externally, the output of D signal is jumping and lots of spurs are seen.

When s2(+4 dBm) is given internally,the output is very clear.

Checked the voltages at IN pin they are matching to datasheet.

kindly provide the best solution or circuit to avoid signal interferences.