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DS90UB926QSEVB: PLL settings in FPD-Link III Deserializer

Frederik Baars
Intellectual 2115 points
Part Number: DS90UB926QSEVB


Hi,

can you provide the following informaton for the PLL settings in FPD-Link III Deserializer in order to measure signals with an oscilloscope:

- data rate

- PLL type (first or second order)

- Loop Bandwidth

- at second order PLL the gain or attenuation (loss)

Would need the information for DS90UB926, DS90UB914, DS90UB948, DS90UB940 in case there are differences.

Thank you!

  • 0
    TI__Genius 10475 points
    Hi,
    We received your query and the Apps engineer will get back to you after further review.
  • 0 in reply to Palaniappan Manickam
    TI__Genius 12705 points
    Hello,
    For FPD-Link Deserializers, the datarate is dependant on the application use case and PCLK of Serializers.
    What type of measurements you are planning to conduct with Oscilliscope will determine settings to use.
  • 0 in reply to Liam Keese
    Prodigy 110 points

    Hi,

    Mr. Baars create this post because of my request.

    We want to look at Eye-Diagram and BER measurements. So, the oscilloskop must regenerate the system clock of FPD III Signal. We have an Keysigth (DSAV134A).

    But we produce testsystems and have a multitude of signals and PCLK.

    Can you tell me the pll type and loop bandwidth.

    How can we calculate the data rate according to PCLK?

  • 0 in reply to Lars Tischendorf
    TI__Genius 12705 points

    Hello,

    To calculate the datarate according to PCLK this is dependant on the specific serializer and deserializer pair. For 92x family this is noted in the AC characteristics

    UI – Unit Interval is equivalent to one serialized data bit width (1UI = 1 / 35 × PCLK). The UI scales with PCLK frequency.

    For estimation of deserializer, set Clock recover using custom PLL with Loop BW at f/15, where f is the PCLK frequency.

    Regards,

    Liam