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ADF4351 on the Analog Devices FMCOMMS1

Question asked by cherif.chibane@ll.mit.edu on Sep 11, 2015
Latest reply on Sep 15, 2015 by rbrennan

Hello,

 

We have a design that consists of modified FMCOMMS1. We have only the Tx sdie and we use 2 AD4351 devices and ping pong among them to increase the hopping frequency.

I have tried using the ADIsimPLL to determine the loop filter but I have a couple of questions:

- The ref clock into the ADF4351 is 122 MHz but the S/W wants 120 MHz is it a problem?

- Once I set the design using the software to determine the settling time I want, How do I get the register values to program into the device.

 

For information, I have the following loop filter and I want settling time to be around 35 uSec.

 

 

Any help is greatly appreciated.

 

Thanks

Cherif

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