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LMK04826BEVM: External Reference Clock

Genius 11115 points
Part Number: LMK04826BEVM

Hello Team,

is it possible to apply an external reference clock at CLKin1 which is NOT 122.88MHz as described in the user's guide, please?

Are there any HW changes required on the EVM?

How to disable the on board VCXO, please?

What has to be done to use an external reference clock?

Thanks and Best Regards,

Hans

  • Hello Hans,
    In which mode you want to operate the device?
    Any frequency clock can be applied on the CLKin1. If dual PLL mode is used, then we need to see if the input clock & onboard VCXO has an integer relationship as PLL1 is a integer PLL. for PLL2 only mode, the input clock should be applied to OSCin. For this, board rework is needed.
    Onboard VCXO can be disabled by board rework (removing the 0 ohm resistor from the VCXO power supply, refer to schematics in EVM user guide).
    Best regards
    Puneet