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Original question:

TMUXHS4212: TI SOLUTION

TMUXHS4212: TMUXHS4212 AC cap placement

Brian Chan
Expert 6480 points
Part Number: TMUXHS4212

Tool/software:

Hi Team

could you help me confirm below placement is correct for customer side?

Our Topology

USB Controller EVB (TX only)

 

DS topology

BTW May I know what is the VBIAS meaning and usage here?

 

BRs

Brian

  • 0
    TI__Mastermind 18095 points

    Hello Brian,

    No issues with the AC caps placements in either diagram.

    The VBIAS if for whenever the common mode voltage exceeds the mux limitation. It is necessary to bias the voltage to a level within the spec of the part.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    TI__Expert 6480 points

    Hi Nir

    appreciate your great reply Slight smile

    do you have any document for define the AC cap position is correct for me?

    BRs

    Brian

  • 0 in reply to Brian Chan
    TI__Expert 6480 points

    Hi Nir

    add customer side question as below.

    We still need to confirm  with you one more question.

     

    Q: The AC cap red  highlighted is still needed in Diagram 1?

     

    If we assume TX of Device has AC cap, maybe it is NOT necessary just like the Path of Diagram 2.

    BRs

    Brian

  • 0 in reply to Brian Chan
    TI__Mastermind 18095 points

    Hello Brian,

    We don't have a specific document, but the datasheet explains where to place AC caps placement.  
    The capacitors need to be on the TX side, or RX side. There is no need for AC caps on both sides. 

    Yes, you are correct. It is not necessary to have the cap there, since there is already one on the TX side. But there will be no issues if the customer keeps it there. 

    Thanks,

    Nir