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AD9548 principle

Question asked by Mirko on Apr 29, 2013
Latest reply on May 3, 2013 by Mirko

Hello,

 

sorry for asking the simple question of basic operation of the AD9548 inside the eval board but somehow I'm still missing the essential button to click.

My aim is to use a 10kHz reference clock and to create say 10MHz (an integer multiple) out of it, with the phases exactly matched.

Following and modifying the suggested setup procedure gives fine signal on clk out and the system is reporting perfect function and stable lock, only the output has no relation to the reference input (0..2V sine wave)- I can even switch it off and the PLL will continue working...

Also all modes of operation (loop mode, Ref selection mode etc.) don't make a difference- no rising edge will ever match the other.

Any hint is very much appreciated!

 

Best regards,

Mirko

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