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TMS320C6727B: Crystal Selection

yoshida.mikihito
Prodigy 40 points
Part Number: TMS320C6727B

I have a question regarding the crystal resonator connected to CLKINpin.
I am currently selecting this crystal oscillator, but the required specifications are not listed in the data sheet.
Could you please tell me about the required performance for frequency stability and jitter? Is there any problem with the following performance?

Frequency: 37.5MHz
Frequency tolerance: ±15ppm
Total jitter: 50ps

  • 0
    TI__Guru 59925 points

    The maximum frequency supported for the crystal reference clock option is 25MHz. See parameter number 1 in the CLKIN Timing Requirements table.

    Frequency tolerance and jitter of the reference clock will be carried forward to the device peripherals. Therefore, the limits associated with these parameters will depend on what is acceptable for your specific system implementation.

    Regards,
    Paul

  • 0 in reply to peaves
    Prodigy 40 points

    Hi Prabes,thanks for looking into this.

    It was overlooked that the oscillation frequency range is 12~25 MHz and 37.5 MHz operation is not supported.

    Does 37.5 MHz operation not work because it is not supported?

    We also learned that other parameters vary from system to system.

  • +1 in reply to yoshida.mikihito
    TI__Guru 59925 points

    The oscillator was only design to operate in the frequency ranged defined in the datasheet. Therefore, your crystal frequency should be within this range.

    Regards,
    Paul