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TMUXHS4412: Is this MUX chip also for HDMI2.0?

Tiger Wang
Expert 1625 points
Part Number: TMUXHS4412
Other Parts Discussed in Thread: HD3SS215, TS3DV642

Dear Sir,

In TMUXHS412 data sheet, its application :

8.1 Application Information

The TMUXHS4412 is an analog 4-channel high-speed mux/demux type of switch that can be used for routing

high-speed signals between two different locations on a circuit board. The TMUXHS4412 can be used for many

high speed interfaces including:

  • Peripheral Component Interconnect Express (PCIe) Gen 1.0, 2.0, 3.0, 4.0
  • USB 4.0
  • Universal Serial Bus (USB) 3.2 Gen 1.0, 2.0
  • Serial ATA (SATA/eSATA)
  • Serial Attached SCSI (SAS)
  • Display Port (DP) 1.4, 2.0
  • Thunderbolt (TBT) 3.0
  • Mipi Camera Serial Interface (CSI-2), Display Serial Interface (DSI)
  • Low Voltage Differential Signalling (LVDS)
  • Serdes Framer Interface (SFI)
  • Ethenet Interfaces

In above application, no HDMI mux/demux mentioned, Is it used to mux or demux HDMI2.0 interface？

Thanks！

  • +1
    TI__Guru**** 166511 points

    Hi,

    For HDMI2.0, please use the HD3SS215 or the TS3DV642.

    Thanks

    David

  • 0
    Expert 1625 points

    Dear Sir,

    I had seen you mentioned mux/demux ic ( HD3SS215 or the TS3DV642.), but I want to find a general mux/demux ic for high speed signal, can you explain why TMUXHS4412 cannot mux/demux hdmi2.0 signal ?

    Best regards.

  • 0 in reply to Tiger Wang
    TI__Guru**** 166511 points

    Hi,

    HDMI is a 3.3V DC-coupled interface, so its common mode voltage is 3.3V, outside the TMUXHS4412 common mode voltage range. 

    The TMUXHS4412 also does not provide muxing of HPD, DDC, or CEC bus. 

    So from electrical and design implementation perspective, the TMUXHS4412 will not fit a HDMI design requirement.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Expert 1625 points

    Dear Sir，

    I also have a question ：how to mux、demux   ac-coulpled  or  dc-coulpled high speed differential signal, for example, DP is ac-coupled ,but hdmi is dc- coupled.

    I can understand that MUX/demux ic  can mux or demux dc-coupled signal, all signal level, positive and negative signal,  are  above 0 zero voltage，but ac-coupled signals, is common mode voltage is zero voltage. How  can the negative signal pass the MUX/DEMUX ic?

    Thanks.

    David

       

  • 0 in reply to Tiger Wang
    TI__Guru**** 166511 points

    Hi,

    I put together couple slides to explain the MUX AX-coupling, does this help?

    AC_Coupling_Placement.pdf

    Thanks

    David