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PCM9211: S/PDIF transmission distance

Kailyn Chen
Genius 9560 points
Part Number: PCM9211


HI,

Our customer  is going to use PCM9211 for the long distance transmission,does PCM9211 support 200m distance with S/PDIF signal? Or do we have any application solution which could be used audio signal(analog or digital audio signal)  transmission of long distance?  

Best regards

Kailyn

  • 0
    TI__Guru 64295 points

    Hi Kailyn,

    I've read a few external sites about this subject and it seems like distances over 10-20m aren't usually advised for S/PDIF transmission.  This makes sense because at some point the capacitance of the coax or other cabling used will load the device output stage and prevent proper signal transmission.

    AES3 seems to be the better choice for longer distance communications.  I pulled the information below from the following site, we can't guarantee it's 100% accurate but it seems to match with the information on other sites and provided a nice overview of the interfaces.

    https://www.rane.com/note149.html

    Differences between AES3 and S/PDIF

    The following table summarizes the differences in the electrical characteristics of AES3 and S/PDIF interfaces:

    AES31

    AES36

    AES3id2

    S/PDIF3

    Interface

    Balanced

    Balanced

    Unbalanced

    Unbalanced

    Connector

    XLR-3

    CAT 5

    BNC

    RCA

    Impedance

    110 ohms

    110 ohms

    75 ohms

    75 ohms

    Output Level

    2-7 Vp-p

    2-7 Vp-p

    1.0 Vp-p

    0.5 Vp-p

    Max Output

    7 Vp-p

    7 Vp-p

    1.2 Vp-p

    0.6 Vp-p

    Max Current

    64 mA

    64 mA

    1.6 mA

    8 mA

    Min Input5

    0.2 V

    0.2 V

    0.32 V

    0.2 V

    Cable

    STP4

    CAT 5

    Coax

    Coax

    Max Distance

    100 m

    400 m

    1000 m

    10 m

    Table 1 indicates a large difference between the minimum output level and the minimum input level (2 V vs. 0.2 V for AES3 for instance). The difference is accounted for by two factors:
    1) Half the signal is loss due to the impedance matching required for high-speed transmission lines (output impedance equals input impedance creating a 6 dB pad); and
    2) Signal loss driving long cables.

  • 0 in reply to Collin Wells
    TI__Genius 9560 points

    Hello Collin ，

    Thank you very much for your detailed information. 

    Best regards

    Kailyn