ADC12DJ5200RF: JESD output length match

Match the differential pair per lane, but it is not mandatory to match all the lanes to each other.

--RJH

Hi Anand,

No you don't have length match the sysref device clock with each other.

Regards,

Neeraj

Hi Anand,

You don't have to length match the device clock and sysref to the device. If you check the EVM for ADC12DJ5200RF you can see our Device clock is coming from LMX2594 device and sysref can either come from LMX2594 or LMK04828 device. So you don't have to length match them but the sysref clock and device should either come from the some clock source or should be derived from the same  source. 

You will only need to length match the Sysref and device clock if you are trying to synchronize multiple devices with each other and want to simultaneously sample at the same instant. 

Regards,

Neeraj 

Hi Anand,

In general you want to be within half a clock cycle you device clock in terms of maximum mismatch. For example if your sampling clock is 5GHz your time period is 200ps so you want the max mismatch to be less than 100ps. 

Regards,

Neeraj