Hi Timo and Nick, The SYSREF is used to synchronize/reset the internal clock divider. This allows for multiple device synchronization. Page 17 of the data sheet states the SYSREF voltage levels and the required setup and hold time with respect to the sampling clock. With regard to the aperture jitter, aperture delay between two devices can be expected to be +/- 200 ps across temperature. Best Regards, Dan
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