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AD9553 doesn't lock

Question asked by BiK on Jul 17, 2017
Latest reply on Jul 21, 2017 by BiK

We use the AD9671Evalboard with an AD9553 on it. At the input we have a 40Mhz differential signal and we would like to get 100Mhz on the outputs. We write to the registers by SPI. Therefore we took the values from the Register Map. (I'm wondering why the register map shows more defined registers than described in the data sheet from the AD9553). Instead of 100Mhz we get 102Mhz with a jitter of about 0.4%. The diode which shows if the pll is locked never shines.

I would be very happy if you could help us.

Thank you very much.

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