Hello David, Yes if your sysref can meet setup and hold for the ADC without calibration then it is not required and can be ignored. You can easily check if you are meeting setup and hold on the ADC side by monitoring the Aligned and Realigned flags in the JESD_STATUS register of the ADC. When you first align sysref both the align and realign flag will be set. After this you should clear the realign flag and then poll this register to ensure it is never set again. If this happens it means that sysref is not being processed properly by the ADC. Thanks, Eric
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