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DIX9211 coaxial inputs

David Goodman
Prodigy 20 points
Other Parts Discussed in Thread: DIX9211

Can I feed one coaxial S/PDIF input into the RXIN0/1 inputs of two different DIX9211s (to create a multi-zone switch)? Or is there some internal biasing that would preclude tying two of those inputs together?

  • 0
    TI__Guru* 98275 points
    David,


    I'm moving this post to the Audio Converters Forum. The engineers that oversee that forum will be able to help you with your question.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Mastermind 28020 points

    Hi Dave,

    There are multiple outputs for the DIX9211, and so you could output the single SPDIF input to two outputs on one DIX9211. Could you explain a little more of what your application is?

    Justin

  • 0
    Prodigy 20 points
    Justin,
     
    I am making a dual zone AVR and I want to be able to select any of the S/PDIF inputs for each output independently. I noticed that there is a coupling cap that needs to be placed on the RXIN0/1 inputs. Could I tie the same coax connection to the coupling caps on two different DIX9211s? Will that degrade the jitter performance?
     
    Dave
     
  • 0 in reply to David Goodman
    TI__Mastermind 28020 points
    Hi Dave,

    I would recommend using an inverter IC, at least 4 inverters, and use it as a buffer, running the SPDIF input through one inverter, and routing that inverted output back through two more inverters, one for each DIX9211. I fear that running one SPDIF coax connection to both parts will be too much capacitance for the coax driver to continue to operate with decent edges.

    Justin