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DS90UB962-Q1: REFCLK 1.8V design

user4979899
Expert 3080 points

Part Number: DS90UB962-Q1

Hi Sir,

For the DS90UB962 we’re feeding the VDDIO pin by 3.3V. (Setting GPIO and others to 3.3V level)
And using a 1.8V Oscillator as reference clock. But could it driving by 1.8V’s clock?(while the VDDIO set to 3.3V, but I saw the typical is 1.2V in datasheet as below)

  • 0
    TI__Mastermind 18755 points

    Hello,

    I just want to make sure I understand the question.  Are you asking if the output of the oscillator will work with the 962 while VDDIO is 3.3V?  It appears to me that max output voltage low will be is about 0.18V and the lowest output voltage high will be is 1.62V.  That means that the smallest the peak to peak voltage can be is about 1.44V which falls within the margin given in the 962 datasheet.

    Regards,

    Nick

  • 0 in reply to Nicholas Darash
    TI__Expert 3080 points

    Hi Nick,

    Yes, the VDDIO is 3.3V.

    So the Vpp 1440mV is not enough(or too margin)?
    But the typical amplitude value is 1200mV. And it is more than the minimum value 800mV.

  • 0 in reply to user4979899
    TI__Mastermind 18755 points

    Hi again,

    Have you tested and it isn't working? Or are you simply asking if the oscillator waveform will work?

    It looks like the oscillator will put out a waveform of 0 to 1.8V which is within the refclk oscillator spec.  Therefore should work with the 962.

    Regards,

    Nick