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DS90UB953-Q1: mode selection

Amelie Zheng
Genius 10865 points
Part Number: DS90UB953-Q1

Hi Team,

Customer found that non-Synchronous is more stable in low temp. So would like to ask the following questions.

1. Is it true that Synchronous mode and Non-Synchronous have different requirements for peripheral circuits, especially the requirements of S11 and S12 are different. Is Synchronous mode more stringent?

2.Which one is more stable? Non-Synchronous external clock or Non-Synchronous Internal Clock mode?

3. As for Non-Synchronous external clock, how to chose from 25M and 50M

4.Is Non-Synchronous only able to run 2G mode, and the AC capacitor here must be strictly selected 100nf+47nf, the AC capacitor selection here is selected according to the mode selection, or due to the change of speed.

5. If we choose Non-Synchronous mode, but we choose the combination of 33nf+15nf for the AC capacitor? What are the risks?

  • 0
    TI__Mastermind 18755 points

    Hello,

    My answers are listed below.

    1. Synchronous and non-synchronous mode have the same channel requirements but the non-sync mode uses a lower speed backchannel which may make meeting the channel spec more difficult.

    2.  External clock mode is going to be much more stable since an external oscillator will likely have much less jitter than the internal oscillator.

    3. You can choose either one depending on what makes more sense in your system, I will say I typically see 50MHz but again it is up to you.

    4. Non-sync mode can operate at 4G like sync mode, the difference in AC cap selection is due to the difference in speed of the backchannel.

    5.  It may still work but it will be harder for the lower-speed backchannel to operate.  I would recommend you stick to what is stated in the table from the datasheet.

    Regards,

    Nick