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DS90UH948-Q1: CLK1 and CLK2 accuracy between one another

Jared Becker
Genius 11845 points
Part Number: DS90UH948-Q1

Hi Team,

When looking at CLK1 and CLK2 at the output of the 948, how closely should those two match each other? Say for example the PCLK for the display should be 150MHz, should CLK1 and CLK2 always be divided perfectly evenly, giving 75MHz for CLK1 and 75MHz for CLK2. Or is there some variation where CLK1 can be 77MHz and CLK2 can be 73MHz?

Is there a certain tolerance of accuracy for their division?

Thank you,

Jared

  • 0
    TI__Guru** 103215 points

    Hello Jared,

    For 948, the channel to channel skew for the OLDI interface has a typical parameter of 100ps. You can find it in the datasheet as "tCCS" and there are also typical parameters for cycle to cycle jitter "tJCC". 

    Since the OLDI interface transmits alternating even/odd pixels on the two OLDI interfaces respectively, they can not have different frequency. Cycle to cycle they could have some small variation in measured frequency due to jitter but they do not ever maintain any long term frequency delta. 

    Best Regards,

    Casey