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LMK05028: LMK05028 TCXO PPM ACCURECY

Qi Liu
Intellectual 2560 points
Part Number: LMK05028

Hi, support team

My customer has the questions as follow:

I want to use LMK05028 with different TCXO then the EVB
my TCXO PN is SiT5155AI-FK-33E0-10.0000x with 0.5ppm freq stability over temp.
if i work with external ref_clk_input there is a importance to the accurecy of the TCXO freq stability over temp?


Thanks so much.

Best regards,
Yuki

  • 0
    TI__Expert 8585 points

    Hello Yuki,

    If the DPLL on the device is used, then the TCXO frequency stability will not effect the output frequency's accuracy. The accuracy of your external ref_clk_input will effect the accuracy of the output as the DPLL locks to the ref clk input and uses it as its input.

    When the device is run in APLL only mode, the accuracy of your TCXO effects the accuracy of your output as the APLL locks to the TCXO and uses it as its input. A 0.5ppm frequency stability for the TCXO means that the output frequency will be within 0.5ppm accuracy.

    Regards,

    Kia Rahbar