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CDCE72010 / phase difference of 20MHz output

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: CDCE72010

Hello,


There are phase difference about 5~6ns between 20MHz output and other frequency output.Please see the attached file as the wave form. There are phase difference.

2781.CDCE72010.pdf

Ref Clock is 10MHz and VCXO is 400MHz.

Could you please let me know this cause ?

And if we can correct this waveform by setting the register, please let me know.


Best Regards,
Ryuji Asaka
  • 0
    TI__Expert 4400 points

    It has to do with not synchronizing the outputs. Based on your use case, can you please apply what's shown in the figure below?

  • 0 in reply to Madhu Balasubramanian
    Prodigy 30 points

    Hello, I have a similar problem. I use CDCE72010 on our boards. On some of them, there is 1.2ns additional delay on the random output after outputs were synchronised. Others boards are OK, all outputs are synchronised correctly. This additional delay is independent on the output divider settings or method of synchronization (external RESET pin or via SPI registers) and delay is the same on the boards with this behavior. Please has anybody the similar experience and found the solution. Thank you. Best regards, Pavel Subrt, RETIA