AD9629 input clock design


I have got a working design with 4 ADCs (AD9629), they have for each an input clock design just like the picture attached.

(I would like to keep 4 times AD9629 for versatility...)

All of my ADC are synchonized to the same clock at 5Mghz.

My question are:

- Is there enough (current/power) for powering 4 Adcs with a single clock differential input?

- Is there any precautions I need to implement?

thanks in advance.

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  • Hi CrazyFrog,

    From a drive strength perspective, it seems to me that your single microcontroller output will have to supply about the same amount of drive power to one transformer that fans out to 4 loads, as it does driving four transformers each driving one clock load.

    So, from a drive strength perspective I think you are OK.

    Try to keep your clock signal path as short as possible to reduce the transmission line effects.

    If there is an output impedance associated with your clock driver pin, you might want to add pads for a possible matching termination resistor, right before the transformer.