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DS34RT5110 - PCB trace to HDMI connector output

Kawai
Guru 19775 points
Other Parts Discussed in Thread: DS34RT5110

Hi Team,

The output pin of DS34RT5110 and the HDMI Connector pin assign is in the opposite direction. In this case you would need to use via and place the HDMI connector on the opposite side of the board.

[Question]
Why was the pin assign designed this way ? I believe it is difficult to keep 50ohm impedance at the via which would cause reflection. Does the device have enough characteristic using the via in the trace between device and the connector, like the EVM ?

[Question]
Our customer will place common mode choke coil (CMCC) to lower EMI.
Do you have a recommendation where you should place the CMCC ?

DS34RT5110--[]------------[]--VIA--[]------------[]--HDMI Connector
                           A                B          C                D

Should you place close to the device output pins, such as point A above ?

Best Regards,
Kawai

  • 0
    TI__Mastermind 29635 points

    Hi Kawai-san,

    To close this thread, T.K. and Nasser are working via e-mail to resolve these questions.

    Thanks,

    Michael

  • 0
    TI__Expert 3175 points

    Hi Kawai-san,

    The part has feed through pin-out. At 3Gb/s, having via is not a big concern. You can reference to the layout of our EVM.

    For common mode choke, they are usually placed at the driver side for EMI concern, or placed in the input side to improve the cable's intra-pair skew. The placement location is not critical, but approximately close to the IC is good.

    regards,

    TK Chin

  • 0 in reply to T.K. Chin
    Guru 19775 points

    Hi TK-san,

    Thank you very much for the answer.

    I understood that via may lead to impedance mismatching but it would not have critical negatively affect to the 3Gbps signal. For the common mode choke, thank you for the information.

    Best Regards,
    Kawai