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DIR9001: The buffer circuit

Eric Mo
Intellectual 970 points
Part Number: DIR9001

Hi Team,

DIR9001 has an S/PDIF input port, which can be directly input when it is an Optical S/PDIF inputs signal.

Why do you need to add a buffer amplifier might be required between the optical receiver module output and the DIR9001 input when it is a Coaxial S/PDIF inputs signal?

  • 0
    TI__Mastermind 23050 points

    Hi Eric,

    S/PDIF output levels as defined in the IEC60958 give the output levels as 0.5V-0,6V peak to peak with min input levels of 0.2V. The input logic levels of DIR9001 are 2V min for a high signal and 0.8V max for a low signal, thus an amplifier is required for typical coax S/PDIF transmission levels. Most optical TOSLINK style connectors are going to generate suitable electrical signals to satisfy the input range of the DIR9001, but if there is long routing between the DIR and the optical connector and the signal edges are not sharp enough or the optical connector does not generate a suitable digital output, then an amplifier may still be required.

    Best,

    Zak