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LMH0397: floating SDI_OUT+/- pins should be disabled?

Kazuhiko Hirano
Genius 12523 points
Part Number: LMH0397

Hello,

My customer is using LMH0397 on their product with the following settings, output both SDI_IO+/- and SDI_OUT+/-.
   EQ/CD_SEL : H (CD Mode)
   OUT0_SEL : L (Enable)
   SDI_OUT_SEL : L (Enable)
However, they do not use SDI_OUT+/- and leave those pins floating now.
Anything go wrong with SDI_OUT+/- floating? 
Or SDI_OUT_SEL should be H(disable) to avoid any wrong affects?

Best regards,

K.Hirano

  • 0
    TI__Guru* 92840 points

    Hi Hirano-San,

    Given SDI_OUT_SEL is enabled, SDI_OUT+/- are active. Further since these are not terminated, there would be reflection creasing noise. In summary, i don't expect anything to go wrong. For best design practice, it would be best to disabled SDI_OUT_SEL: H(Disable) or terminate these with 75-ohm to GND(after AC coupling).

    Regards, Nasser