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LLC_DLL mux phase shift on adv7842

Question asked by mbu on Nov 10, 2014
Latest reply on Nov 10, 2014 by GuenterL

Hi.

 

We have a design with adv7842 where we had to adjust the phase of the LLC clock to adapt to the back-end fpga.

 

Ie.enabled LLC_DLL_MUX and LLC_DLL_EN and setting phase in LLC_DLL_PHASE.

 

This works and we can adjust the phase.

However, looking more closely at this we have found that phase-shift seems to depend on the LLC frequency.

 

Our LLC frequency range form 25MHz to 154MHz.

 

We would expect that the phase shift was constant with regards to the data/sync.

 

There have been some posts on this before, for instance:

 

https://ez.analog.com/message/151804#151804

https://ez.analog.com/message/43620#43620

 

But could you shed some light over phase-shift versus frequency on the LLC_DLL mux ?

 

Regards,

Martin

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