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TLC2933A

Yuliya Parkanskaja
Prodigy 10 points
Other Parts Discussed in Thread: TLC2933A, TLC2932, TLC2932A

Hi

I'm after some support in designing a filter for the TLC2933A. Its appears to have changed from the TLC2933 and I'm unsure if the calculations still hold true. I need reject jitter as much as possible and any notes etc would be a great help.

 

  • 0
    TI__Genius 16810 points

    Yuliya,

    Thank you for your interest in the TLC2933A.  We will check into the differences between the TLC2933 and TLC2933A and reply to your question as soon as possible.

  • 0 in reply to Larry Taylor
    TI__Genius 16810 points

    Yuliya,

    Attached is what I have been able to find on the TLC2933A loop filter.  It contains a loop filter recommended for the TLC2933A.

    Compared to the TLC2933, the TLC2933A has a wider lock range and the VCO gain is different, so the loop filter is not the same.

    Other differences:

    - The TLC2933A is specified at 3.3V.

    - Pin 8 of the TLC2933Amust be connected to GND

       Questions about your application:

       - Vdd requirements

       - Frequency to Fin-A : ? Hz

       - VCO out frequency : ? MHz
       - Jitter performance requirement : ? nsec
       - Lock speed : ? msec
    Regards,
    Larry
    TLC2932A33A_Feb07_E.ppt
  • 0 in reply to Larry Taylor
    Prodigy 65 points

    Hi Larry,

    Would seek help in the following:

    Customer has an old board designed with TLC2932 , with pin 8 left unconnected.(NC).

    TLC2932A , supposed to replace this older chip, and pin 8 need to be connected to GND .

    In specific, if using TLC2932A, and pin 8 left NC , what would be the side effects ?

    Able to share a rough schematic (internal chipset of TLC2932A), or rough system architecture will do .

    This is for customer to gauge effects of any stray voltage /or floating voltage at pin 8 ( if left NC, for TLC2932A)

    Thanks.

  • 0 in reply to Larry Taylor
    Prodigy 30 points

    Hi,

    Can anyone here suggest what frequency divider is most suited for TLC2933A??

    Warm Regards,

    Hadi