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Posts: 1
Registered: ‎02-07-2015

Si5351A driven with an external clock generator

Hi,

my need is to use a si5351A (not B nor C) driven with an external clock through the XA input pin (as described in the datasheet)

 

what is the maximum / minimun frequEncy range allowable ???

 

Is the 26 MHz (my OCXO) correct ???

 

thanks in advance 

 

regards

 

Mauro ik1wvq

 

 

 

Posts: 69
Registered: ‎09-10-2014

Re: Si5351A driven with an external clock generator

Hi,

 

Yes. you can use any frequency between 25 MHz and 27 MHz.

However, our clock builder tool will not allow you to "choose" 26 MHz reference.

 

In order to make sure that the tool works, you consider the following option.

 

Lets say, you need CLK0 to be F0 MHz, CLK1 to be F1 MHz etc. with a 26 MHz input :

 

Choose, Crytal input  = 25 MHz and choose CLK0 freq = F0*25/26,

CLK1 freq  = F1*25/26 etc ..

 

This will ensure that you have the plan you need.

 

Regards,

Hari