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TI Home » TI E2E Community » Support Forums » Data Converters » Audio Converters » Audio Converters Forum » PCM1793 DAC Analog Output Spec Confusion
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PCM1793 DAC Analog Output Spec Confusion

This question is not answered
Steve MacLeod
Posted by Steve MacLeod
on Jul 27 2012 14:49 PM
Prodigy140 points

This DAC has differential outputs.  The full scale output is specified as 3.2Vpp.  The bipolar zero voltage is specified as 1.4V.  Questions: Is there a common mode voltage on the high and low outputs?  Does the high output swing above and below the low output, or is it unipolar?  Asking another way, what are the absolute voltages (referenced to ground) of the high and low output at zero scale and at full scale?

PCM1793
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  • Don Dapkus
    Posted by Don Dapkus
    on Jul 31 2012 20:39 PM
    Guru105865 points

    Hi, Steve,

    We are looking into this for you.

    -d2

    -----

    Don Dapkus

    Audio Applications Engineering Manager

    Dallas, TX USA

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  • Patrick Galvin
    Posted by Patrick Galvin
    on Aug 01 2012 14:56 PM
    Genius16290 points

    Steve,

    The analog output should be centered around the bipolar zero, so yes there should be a common mode voltage on both high and low outputs of roughly 1.4V, with absolute voltages ranging from 2.2 to 0.6V roughly.

    Patrick Galvin

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  • Steve MacLeod
    Posted by Steve MacLeod
    on Aug 02 2012 09:44 AM
    Prodigy140 points

    Thank you, Patrick.  That clears it up for me.

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