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LMX2820EVM: Clarification for no alteration for previous design

ArTzy
Genius 16670 points
Part Number: LMX2820EVM
Other Parts Discussed in Thread: LMX2487E

Tool/software:

Hi Experts,

We received query about the operation of this unit - LMX2820EVM.

I have a stable 100MHz OCXO that I plan on using for the OSC input. My research group currently operates an LMX2487E for producing a 3.417GHz frequency, and we had to replace the onboard VCO with a custom one to achieve this. I wanted to be sure no alterations need to be made on the board to produce the frequency range of the board.

Further, I would like to clarify the use of the RFIN of the unit. That's used to phase lock an external VCO to the OSC input, and reduce the N to improve the phase noise, correct? 

Thank you.

Regards,
Archie A.

  • 0
    TI__Mastermind 24811 points

    Hi Archie, 
    You can leave the EVM as is for quick evaluation but on your own board please use PLLatinumSim to calculate optimal loop filter values for your application. 

    ArTzy said:

    Further, I would like to clarify the use of the RFIN of the unit. That's used to phase lock an external VCO to the OSC input, and reduce the N to improve the phase noise, correct? 

    That is correct - RFIN pin can be used for external VCO mode. 

    Regards, 

    Vicente