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ADF4351 Output Spur

Question asked by rorroror on Feb 13, 2018
Latest reply on Feb 15, 2018 by rorroror



I am using ADF4351 to get a signal at 556 MHz. Here is the output below.

There are spurs at every 70kHz. When i change the output frequency, spurs exist at every 70 kHz like in the picture above. I am using a custom board. The loop filter is the same as the eval board. The register settings are:

When i disable the CSR, output signal dissappears. I send all the register accourding the sequence. Also, i send them twice to get a signal.


Best regards.

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