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AD9552 clock not phase locking on power-up

Question asked by atomicgreg on Mar 29, 2016
Latest reply on Mar 29, 2016 by atomicgreg


Hello,

 

I am using the AD9552 evaluation board with an external 10 MHz reference. My problem is that when I turn on the board, it doesn't phase lock to the reference reliably. I have to cycle the power on the board several times to get it to phase lock. I've also found that I can get the board to phase lock by reducing the DC offset to zero and ramping it up to 1 V by hand. Switching the DC offset on and off does not seem to produce a phase-lock reliably.

 

I've added a DC bias of 1 V to the external reference with a bias tee. The peak to peak amplitude of the clock is 1.2 V.

 

Any ideas?

 

Thanks!

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