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PCM1804 input voltage

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Kenichi2
Posted by
on Feb 29 2012 07:08 AM
Prodigy85 points

About analog input voltage for PCM1804.

 

The datasheet says as following.

Absolute Maximum Ratings: 10Vp-p(differential input)

Recommend Operating conditions : 5Vp-p(differential input)

 

If they use between 5Vp-p and 10Vp-p.

Is there any problem?

Let me know any concern about it.

 

Best regards,

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  • Don Dapkus
    Posted by
    on Mar 01 2012 00:23 AM
    Guru106005 points

    Hi, Kenichi,

    Where do you see the 10Vp-p in the data sheet?

    You definitely should attenuate the signal to fall within the recommended range of 5Vp-p.

    -d2

    -----

    Don Dapkus

    Audio Applications Engineering Manager

    Dallas, TX USA

    PCM1804
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  • Kenichi2
    Posted by
    on Mar 06 2012 06:06 AM
    Prodigy85 points

    Hello,

    About PCM1804,

    What kind of output  would be expected under following condition?

     

    <Conditions>

    VDD=5v, Vref-2.5v,

    Input to Vin R+ : sine wave 0.75v-4.25v

    Input to Vin R-  : sine wave 0.75v-4.25v

                            (Inverted of Vin R+ input)　　　

     

    Regards,

    Report Abuse
  • Don Dapkus
    Posted by
    on Mar 07 2012 08:55 AM
    Guru106005 points

    Hi, Kenichi,

    I have asked one of my colleagues to help you with this question.

    -d2

    -----

    Don Dapkus

    Audio Applications Engineering Manager

    Dallas, TX USA

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  • Kenichi2
    Posted by
    on Mar 07 2012 17:57 PM
    Prodigy85 points

    Hi Don,

    We hope to get reply from you soon.

    Thanks,

    Kenichi

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  • Patrick Galvin
    Posted by
    on Mar 12 2012 16:45 PM
    Verified Answer
    Verified by
    Genius16290 points

    Kenichi,

    Because the VCOM internally is still 2.5V as well, there is potential for is clipping and other issues if the input voltage exceeds that total 5V.  So with a input voltage 4.25V and a VCOM of 2.5V this is still not recommended. 

    Patrick Galvin

    Report Abuse
  • Kenichi2
    Posted by
    on Apr 04 2012 21:32 PM
    Prodigy85 points

    Hi Patrick,

    We are promoting PCM1804DB to a Japanese customer. 
    They put a volume in front of PCM1804 differential input.
    Output from the volume reaches 10Vp-p at fully turn it up. 
    Reason why they apply such ; 
    Medium volume position is quite typical as user's setting, so output
    smaller than maximum. 
    Considering AD conversion efficiency, the smaller(typical) waveform 
    amplitude might be closed to Full-scale(5Vp-p). This is their concept. 
    They have understood the usage risk under maximum ratings. 
    So that, planning to set narrow the full range as well. 
    However, believe 5Vp-p as full range(just in recommended operating conditions)
    is not efficent based on their concept. 
    They try to put DAC in back of PCM1804 and check the analog output 
    under input between 5Vp-p and 10Vp-p. 
    Sometimes, not clipping data(ie, like bouncing) can be observed. 
    They want to obtain similar information if you have. 
    Of cource, they don't nequire quality assurance even if we disclose such 
    information for them.
    They take care for the usage risk of out of our recommended by themselves. 
     
    Best Regards,
    Report Abuse
  • Kenichi2
    Posted by
    on Apr 16 2012 07:31 AM
    Prodigy85 points
    Hi Patrick, We are promoting PCM1804DB to a Japanese customer. They put a volume in front of PCM1804 differential input. Output from the volume reaches 10Vp-p at fully turn it up. Reason why they apply such ; Medium volume position is quite typical as user's setting, so output smaller than maximum. Considering AD conversion efficiency, the smaller(typical) waveform amplitude might be closed to Full-scale(5Vp-p). This is their concept. They have understood the usage risk under maximum ratings. So that, planning to set narrow the full range as well. However, believe 5Vp-p as full range(just in recommended operating conditions) is not efficent based on their concept. They try to put DAC in back of PCM1804 and check the analog output under input between 5Vp-p and 10Vp-p. Sometimes, not clipping data(ie, like bouncing) can be observed. They want to obtain similar information if you have. Of cource, they don't nequire quality assurance even if we disclose such information for them. They take care for the usage risk of out of our recommended by themselves. Best Regards,
    Report Abuse
  • Patrick Galvin
    Posted by
    on Apr 16 2012 17:26 PM
    Genius16290 points

    Kenichi,

    Unfortunately we do not have performance data for operation that exceeds the specification.

    Patrick Galvin

    Report Abuse

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