What do I need to build a DAC for an I2S interface?

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Bricolo

Bricolo

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Joined 2002
#1
Hi all


I never build something for digital, so I don't know much about it.
I only read some topics here about dacs, and if I have correctly understood, a basical dac needs:


an optical reciever, a decoder, a dac, and a I/V stage

but I think this is for spdif, how is it for I2S (I mean something like a cdpro2), and I heard that I2S is the best way to go.


Can you also tell me wich chips are good?



thanks a lot
Alex
 
#3
Peter Daniel said:
Philips chips accept I2S directly. All you need is a DAC chip and output stage. Here are some links:

http://home.student.utwente.nl/f.s.bouwman/audio/nonoz.html
http://www.diyaudio.com/forums/showthread.php?s=&threadid=5798&highlight=non+oversampling+dac

If you want to go with oversampling DF1704 accepts I2S directly as well. In all those cases you simply are not using the receiver.
Click to expand...
So, with no oversampling-> I2S directly to a PCM1704 (that's an exemple)
, then to an I/V
with oversampling-> I2S-> DS1704->PCM1704->I/V


No brickwall filter or something like this? (how does such a filter work?)



thanks Peter 😉
 
#4
Bricolo said:

So, with no oversampling-> I2S directly to a PCM1704 (that's an exemple)
, then to an I/V
with oversampling-> I2S-> DS1704->PCM1704->I/V


No brickwall filter or something like this? (how does such a filter work?)



thanks Peter 😉
Click to expand...


PCM1704 doesn't accept I2S format. You have to either use DF1704 (oversampling) or a sort of logic to make it compatible (non-oversampling).
 
#7
I2S

Would I need any special attention to plugs or cable if I used an external DAC? (Feeding it I2S).

And if it were that easy/simple...why are manufacturers wasting money on the extra circuit for SPDIF...?

Arne K
 
#8
I am not expert in that regard, but it's my understanding that I2S connection is limited to a certain safe length only, within a player itself. If the cable is longer you might need special sending and receiving circuits, like featured on Sonic Frontiers DAC, and that is more complex and expensive than SPDIF.
 
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