Strange 50 MHz clock riding on top of SPI signal. AD3304 pin 20?? Ideas?
If it is the ADG3304, which is the level translator, then I would say the oscillation is coming from it.
Using 33 ohm before and after the I/O sometimes helps.
Maybe you can check with the apps team of the ADG3304 to see what they recommend.
What is the AD3304? can't find it.
What schematic are you looking at?
Sorry trying to help but missing info.
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