This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMX2594EVM: LMX2594EVM

Part Number: LMX2594EVM
Other Parts Discussed in Thread: LMX2594,

Hello,

* Is it possible to SYNC the board with 10MHz Spectrum-Analyzer reference clock? Or would it be possible to provide the 10MHz as Fosc instead of 100MHz?

We would like to have a full setup based on the Spectrum-Analyzer reference clock 10MHz. So is there another supporting board which accepts 10MHz reference clock and generate 100MHz.

* Is there an EAR99 or similar certificate of the board (CE, REACH, ...)?

  • Dear Alyafawi,

    The sync feature works under many use cases with a reference input up to 100 MHz when in the "category 3" use case; so 10 MHz is no problem. See figure 26 of the D/S. Assuming you are in use case "category 3", you will need to provide a cohenrent sync pulse with the 10 MHz reference to the sync pin.

    You can bypass the on PCB 100 MHz reference with zero ohm resistor and connect your favorite reference via the sma connector.

    The EVM (PCB) AND LMX2594 are EAR99.

    Regards, Simon.
  • Dear Simon,

    Thanks for your reply.
    I received an LMX2594EVM from a local distributor and found it is missing two components: the XO and the voltage regulator. Is it some of your manufacturing variations or shall I return the board?

  • Consider this manufacturing variations;  the board is functioning.   The LMX2594EVM is in extremely high demand and we have run out of stock a few times.  In fact, I would not be surprised if we are not out of stock now.  We ran into an issue where the crystal was not available and also the regulator.  These components are not critical to use the board.

    The ReferencePro board has a 100 MHz output that can be used and the regulator was never actually hooked up.

    Regards,
    Dean

  • Thanks for your reply.

    With the ReferencePro board, would it still be possible to use the 10MHz sync clock?

    As the 100MHz will be coming from the ReferencePro and the Sync bin is on the LMX2594EVM

    All regards,

    Alyafawi

  • The sync signal cannot be a clock. You will need a reference (applied on OSCin) and a COHERENT sync signal. regards, Simon.