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TMDS442 / GND separation of HDMI

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: TMDS442
Hi team,
 
My customer is considering TMDS442 for adoption.
He designs peripheral circuit of the device and concirned if it is necessary to separate each GND of DDC/CEC(17pin), TMDS Data Shield(2,5,8,11pin), FG(outer periphery of connector and chassis).
 
Is there any recommendation of GND separation with TMDS442?
This isn't pure question of the device(TMDS42), so I think it may be difficult to answer...but I'm glad if you give me a comment.
I also heard that there is competitive device that GND separation is recommended.
 
Best Regards,
Yaita / Japan disty
  • 0
    TI__Guru* 76130 points

    Hello Yaita-san,

    You don't need to separate the ground for those pins, what needs to be isolated are the different voltage rails, for example VCC_IO, VCC_PLL, etc.

    When using connectors, it is recommended to connect the connector chassis to the power ground through a filter to reduce EMI (like the picture below)

    You can find more information about PCB Design guidelines here http://www.ti.com/lit/an/scaa082/scaa082.pdf