[Fpga-synth] Stereo Audio Interface

[Eric Brombaugh]

On Aug 6, 2008, at 9:52 PM, Mason wrote:

> Magnus Danielson wrote:
>> I would also enjoy seing the counterpart, a stereo 24-bit ADC/192  
>> kHz showing up eventually.
> Indeed, though personally I'd be more interested in both combined --  
> that may just be the greedy person in me.
> If I had time these days to do anything with my 3AN board I'd  
> certainly buy one, but as it stands, I must pass for now.

Not greedy at all - it's a nice goal to have. Unfortunately, a  
combined ADC/DAC codec requires at a minimum 5 I/O signals (mclk,  
sclk, lrclk, di, do) and there are only 4 signals available on the  
Digilent 6-pin connectors. Because of that it's more practical to put  
the ADC and DAC on separate connectors.

I know what you mean about time though - so much to do. I haven't done  
anything with my 3AN besides power it up and watch the blinky lights.

>> While 3.5 mm stereo-jack is good enought for easy listening, I  
>> would try to fit some other jacks to it eventually. But that's the  
>> audio pro within me speaking.
> That seems like it should be one of the easier parts.

I'm providing 3.5mm a stereo jack because it's small (the board is  
small), inexpensive and 'least common denominator' - most audio  
equipment will support it natively, or with readily available  
adaptors. If you'd prefer gold-plated, oxygen-free copper BNC jacks  
with low dielectric teflon insulators and 2GHz frequency response then  
you're free to pull the stereo jack off and solder your own connectors  
on. :)

Eric