I'm currently working on the AD9548 using the Analogue Devices evaluation board. We are integrating it into an existing system which has a 10MHz sinewave source and we were hoping to utilise this as the AD9548 stable source.
I have read in the data sheet that when using a sine source the frequency ideally should be above 20MHz, will a signification degradation in performance be seen if we remain with our 10MHz source? As a note i am using the clock doubler within the clock multiplier.
In addition to the above the data sheet mentions the ideal source to be AC-coupled/1Vp-p/CMOS. With a sinewave of 10MHz what size capacitor would be best for the ac-coupling? In addition to this should the sinewave be 1Vp-p before or after the blocking capacitor(ac-coupled)? With a 1Vp-p sinewave signal before my blocking cap I'm seeing a 500mVp-p signal after that is dc offset by ~1V at the AD9548 source pin. I'm only using SYSCLKP and not SYSCLKN which is isolated from SYSCLKP and has had a decoupling capacitor to ground added at R30 as suggested.
Hope my questions are clear and look forward to any replies.
Thanks in advance.