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DS90UB926Q-Q1: Spread Spectrum

Hung Yu-chuan
Prodigy 120 points
Part Number: DS90UB926Q-Q1

Hello Team

                 1.Can serializer and deserializer spread spectrum be turned on separately? 

                 2.Will there be any other side effects if both are turned on at the same time?

  • 0
    TI__Mastermind 22830 points

    Hi Hung Yu-chuan,

    The 926 can generate SSC to modulate clock and data outputs. However, the datasheet states that SSCG should not be enabled if the source PCLK into the serializer already has spread-spectrum clocking.

    Best regards,
    Ikram

  • 0 in reply to Ikram Haque
    Prodigy 120 points

    Hello Ikram

                     TX:DS90UB934 

                     RX:DS90UB926

                    1.When TX transmits image signals to RX, there will be small noise in the red box as shown in the picture below. What may be the cause?

                    2.When the TX(DS90UB925) changes to a different model, there will be no problem with the following small red box noises

  • 0 in reply to Hung Yu-chuan
    TI__Mastermind 22830 points

    Hi Hung Yu-chuan,

    Hung Yu-chuan said:
    TX:DS90UB934

    Did you mean DS90UB925?


    Hung Yu-chuan said:
      2.When the TX(DS90UB925) changes to a different model, there will be no problem with the following small red box noises

    So, this occurs only on one 925 unit? how many different 925 units were tested?
    Does it occur repeatedly, continuously after power up every time?
    Does doing a Digital Reset on the 925 ( register 0x1[0] = 1), clear the issue?


    Also, are they just two spots or is it along the whole horizontal line?


    Best regards,
    Ikram