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Frequency deviation in Concerto

Masoud Zamani
Intellectual 830 points

Hello,

Brief, I wonder if I use a 10 MhZ clock for Concerto which has 1 KhZ deviation, then does it causes any problem for correct operation of concerto. In other words, how much is the tolerance of Concerto for clock variation?

Detail explanation:

I want to use Crystal in clock generation of Concerto. However, " Hardware Design Guidelines for TMS320F28xx and TMS320F28xxx DSCs" stated that Cstray is 5 pF while in the control card design it is assumed 2.5 pF. based on the following chart there is almost 100 PPM deviation in clock frequency. Now if I use 10 MhZ clock that will be some thing around 1 kHz deviation. I wonder, if there is 1kHz deviation in my clock which is 10 MhZ, does it causes any problem for concerto operation?

Thanks in advance.

 

"

  • 0
    TI__Guru 60865 points

    Masoud,

    That is actually a really interesting question.  Technically we don't guarantee operation in the datasheet beyond 100MHz for the M3 or 150MHz for the C28x. However, from a practical standpoint, you won't have any issues running from an input clock of 10MHz +/- 100ppm.  

    Are you looking for formal approval from TI that the device will meet these operating conditions, or do you just want to know if it will work? I don't think getting a formal statement would be a problem, but it may take some time.  

  • 0 in reply to Devin Cottier
    Intellectual 830 points

    Dear Devin,

    Thanks a lot for comprehensive response. Since, our company will have high volume production, I will appreciate if you let me know how I can get formal approval from TI that the device meets the operating conditions.

    Thanks in advance,

    Masoud.

  • 0 in reply to Masoud Zamani
    TI__Guru 60865 points

    Masoud,

    Understood. I will start work on figuring out how to get some formal approval.  Preferably this will be an update to the datasheet.  This will probably take awhile - at least a few weeks, but possibly longer.  

    If you don't get an update after a few weeks, feel free to contact me directly at dcottier AT ti DOT com.

  • 0 in reply to Devin Cottier
    Intellectual 830 points

    Dear Devin,

    Thanks a lot for prompt reply and your tries.

    Best regards,

    Masoud.