Hi, Would you be able to share a schematic of the circuit? Also, do you know if there a dedicated PCB ground plane layer below the ADCs, or is the ground plane only poured on the top layer? In the attached image it appears as if AGND and DGND do not connect though short paths. It is possible that the CLKOUT signal may be creating a lot of noise on these ground planes, and in turn interfering with the conversion results of both ADCs. [quote user="user5163865"]Customers say Xtal's oscillation will be abnormal. Is this incorrect?[/quote] I am not sure what you mean by the XTAL oscillating being abnormal. Is the customer observing abnormal behavior on the crystal? If so, would you be able to describe the abnormality? [quote user="user5163865"]Does the two ADCs share CLKOUT as a clock?[/quote] The current configuration is correct. CLKOUT is an output signal and it can be routed into the CLKIN input pin on another device. Best regards, Chris
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