If you only need to do voice then you could probably get away with a 12cxxx and
an rs-485 transciever on each end.  The transmitter would use it's A/D (12c6xx)
to convert the voice to digital (8kHz should be enough), and the receiver could
use PWM to output the signal.

Of course, this begs the question:  Why are you digitizing voice for
transmission of only 30m?  Why not hook two phones up with a twelve volt power
supply and a ring circuit?

-Adam

Andrew Seddon wrote:
>
> Hi.
>
> Can anybody recommend an ADC with SPDIF output or similar??
>
> I am trying to transport a sound signal about 30m over a twisted pair. I figured I could use an off the shelf audio ADC with SPDIF output which I belive could be buffered through a 422 converter to get the range. The signal is essentially voice so 44.1khz+ is fine.
>
> I have done a good internet search but I can`t find many stand alone ADC`s.. Just multi channel etc.. I only need one channel and the unit needs to be pretty small.
>
> Thanks all.
>
> Andrew Seddon
>
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