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DS90UB936-Q1: AC-coupling capacitor

user5782676
Prodigy 40 points
Part Number: DS90UB936-Q1

Hello,

I have a question about the AC-coupling capacitor in RIN+/RIN- of DS90UB936-Q1. If the both AC-coupling capacitor in RIN+/RIN- are 100nF, but Deserializer is Synchronous Mode and Coaxial Connection,  I want to know what the impact of this design is? Will it affect the MIPI signal output?

Looking forward to your reply. Thanks!

  • 0
    TI__Mastermind 27980 points

    Hi,

    This design difference is outside of the recommended operating conditions and therefore has not been validated. I can only recommend swapping the 100nF caps on the RIN- pins with 47nF caps.

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    Prodigy 40 points

    Hi ,

    At present, the product has been mass-produced. May I help you analyze the impact from the internal structure and working mechanism of the chip?

    Thanks！

  • 0 in reply to user5782676
    TI__Mastermind 27980 points

    Hi,

    The reason we recommend using 47nF caps on the RIN- pins is because the total capacitance on RIN+ and RIN- should match. Since RIN+ has 2 100nF caps across the channel on the SER side and the DES side, the total series capacitance is 50nF which is close to the 47nF recommendation on RIN-. When the total capacitance on RIN+ and RIN- do not match, there is a risk of the margin being affected which could affect signal quality and lock status.

    Best,

    Lucas