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Question about ADF4106 in ADIsimPLL

Question asked by J.Park on Jun 18, 2017
Latest reply on Jun 19, 2017 by J.Park

Hello !

I have a question about an error in ADIsimPLL.

I'm now designing an integer-N PLL to synthesize 50 MHz to 800 MHz.

Simply, when I use internal prescaler, I should set division ratio to 16.

 

However, when I try to use ADF4106 in ADIsimPLL, following message appears.

 

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ADF4106 is incompatible with these requirements:

P=8 Prescaler cannot achieve N value of 16

P=16 Prescaler cannot achieve N value of 16

P=32 Prescaler cannot achieve N value of 16

P=64 Prescaler cannot achieve N value of 16

 

No valid prescaler option could be found.

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I cannot understand this message, because I think division ratio of 16 is possible according to datasheet of the ADF4106. (For example, just use only 6-bit A counter, 010000)

 

Is there any misunderstanding...?

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