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LMK04133: clock out termination

Michelle Tange
Prodigy 120 points
Part Number: LMK04133

HI

I am not sure how to terminate the LVCMOS clock output from the lmk04133.

I need to connect it to a 50 ohm sma connector.

Do I just connect it with a 50 ohm pcb trace or do I need a resistor and/or capacitor to gnd?
If so, I guess the resistor should be 50 ohm, but I don't know about the capacitor. The clock frequency will be between 75 MHz up to 320MHz

Regards Michelle

  • 0
    TI__Genius 9920 points
    Hi Michelle,
    If you need a 3.3V LVCMOS clock, suggest to insert a 0 Ohm close to LMK04133 output for signal integrity tuning.
    LMK04133 CLKout pin --> 0 Ohm --> PCB Transmission Line --> SMA .
    If you only need a swing in +/-3.3V/2, then continue to insert a capacitor.
    LMK04133 CLKout pin --> 0 Ohm --> PCB Transmission Line --> AC cap--> SMA .

    Best Regards,
    Shawn