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LMX2820: Sharing PSYNC signal between two parts

ArTzy
Genius 13999 points
Part Number: LMX2820

Hi Experts,

Good day.

This case is in reference with this POST about PSYNC fxn of our RF synthesizer - LMX2820. Our client would want to know about this implementation.

In order to implement this function, the instructions are to run the PSYNC control signal through a 100 Ohm resistor to the PSYNC pin. If they are going to sync two LMX2820 parts together, should they run two PSYNC control signals - one to each LMX2820? Or use one PSYNC control signal to both parts? Their example: have one PSYNC control routed to a 100 Ohm resistor and split the output of the resistor to the two PSYNC pins?

May we know also what is the purpose of 100 ohm resistor here?

Thanks for your guidance.


Regards,
Archie A.

  • 0
    TI__Guru* 81580 points

    Hi Archie,

    If the system host can provide two separated, phase aligned PSYNC signals, that will be great. If not, then one PSYNC signal can be split to two and then put a series 33Ω to 100Ω resistor on each signal trace. The series resistors are used to limit the current flow at the PSYNC pin.