[alsa-devel] USB asynchronous mode feedback format

Julian Scheel julian at jusst.de
Fri Oct 15 10:59:32 CEST 2010

Am Donnerstag, 14. Oktober 2010, 17:39:13 schrieb Daniel Mack:
> Well, even if it was, you should hear some sound. It might be distorted,
> but if you don't get any output, the reason is somewhere else.
> Did you check the schematics of your board in comparison to the
> reference diagrams in the codec's datasheet? Are there any other things
> to be considered maybe?
> What about the voltage levels? Are they within the specs? I had a quick
> look and it seems that Vdd on the codec has to be within 3.0 .. 3.6V,
> while the signals you provide rather seem to be in the range of 5V? The
> absolute maximum ratings say that Vdd must not be greater than 4.0V.

Sorry for one more off-topic mail, but I rechecked it. Digital Input Voltage 
is -0.3V to 6.5V, so my 5V clock voltage should be fine imho. Vdd is 3.0V on 
my board...
Do you maybe have any other thoughts what might be wrong here?


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