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DS90UB954-Q1: DS90UB954-Q1

Ginni viyogi
Prodigy 45 points
Part Number: DS90UB954-Q1

Tool/software:

Hi,

I am using this IC kindly tell us how the voltage (value) affects the PoC filter components like inductor value and resistor value of filter.

as i have used this IC for 10volt as well as for 15 volt so can i use the same inductor in both the scenario??

  • 0
    TI__Mastermind 24941 points

    Hi Ginni,

    Based on the feedback we have from passive component vendors (inductor vendors such as TDK, Murata, Coilcraft, etc.) the impact on the performance of the inductors is current load, not voltage. Take care with capacitor derating as DC bias increases.

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Prodigy 45 points

    Hi,

    Kindly Answer the following question 

    1. Which capacitor You are talking about Derating? are they CAC1 and CAC2?

    if yes then we are using same capacitor (50volt rating) for both 15 Volt and 10 Volt input can we go with this?

    2. is it compulsory that RX and TX side capacitor should be same?

  • 0 in reply to Ginni viyogi
    TI__Mastermind 24941 points

    Hi Ginni,

    Which devices will these be? Will this be UB953 and UB954? Generally we would recommend to match AC caps with 100nF and 47nF. CAC1 will be exposed to the PoC voltage, and effective capacitance will change due to this. 50V rating should be sufficient to prevent significant derating at 10V or 15V.

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Prodigy 45 points

    Hi Thomas,

    Yes, we are using UB953(Serializer) and UB954(DeSerializer)

    1. As per Datasheet of UB953 and UB954 It is recommended to use CAC1 33nF and CAC2 15nF for both side RX ad TX. But it is also mentioned that we can use Capacitor between 33nF to 100nF (CAC1) and 15nF to 47nF (CAC2). Please refer below image. So, let us know is it mandatory to use same value of capacitor in both sides. Because  i have this combination of capacitor TX(CAC1) 33nF and TX(CAC2) 15nF RX (CAC1) 100nF and RX(CAC2)47nF. Does this form any impact on data transfer?

    2. If i want to change some of the component in PoC filter based on my requirement then what parameters should i consider to check on PoC filter? Let us know the parameters on which PoC filter depends.

    3. Is there any simulation process or tool to check PoC filter?

  • 0 in reply to Ginni viyogi
    TI__Mastermind 24941 points

    Hi Ginni,

    It's not mandatory to match the AC cap on ser & des.

    For PoC network design, the applicable spec would be the channel spec. Please review the attached document for details on PoC network design.

    Sending Power Over Coax in FPD-Link Designs (Rev. A)

    Best,

    Thomas