What do I need to build a DAC for an I2S interface? - diyAudio
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Old 22nd March 2003, 10:32 AM   #1
Bricolo is offline Bricolo  France
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Default What do I need to build a DAC for an I2S interface?

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
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Old 22nd March 2003, 02:18 PM   #2
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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.b...dio/nonoz.html
Non Oversampling DAC-complementing CD-PRO

If you want to go with oversampling DF1704 accepts I2S directly as well. In all those cases you simply are not using the receiver.
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Old 22nd March 2003, 03:53 PM   #3
Bricolo is offline Bricolo  France
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Quote:
Originally posted by Peter Daniel
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.b...dio/nonoz.html
Non Oversampling DAC-complementing CD-PRO

If you want to go with oversampling DF1704 accepts I2S directly as well. In all those cases you simply are not using the receiver.
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
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Old 22nd March 2003, 04:03 PM   #4
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Quote:
Originally posted by Bricolo

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

PCM1704 doesn't accept I2S format. You have to either use DF1704 (oversampling) or a sort of logic to make it compatible (non-oversampling).
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Old 22nd March 2003, 05:05 PM   #5
Bricolo is offline Bricolo  France
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okay


what are you using in your player (the cd pro 2 based one)? are you using the AD1865 with a tweak to use I2S?
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Old 22nd March 2003, 05:28 PM   #6
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I'm using digital out from a player and that goes to outboard DAC with CS8420 receiver, DF1704 and 4 x PCM1704K. Didn't have a chance to try I2S yet. It sounds pretty good as it's now, that's why no rush to change things.
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Old 22nd March 2003, 06:42 PM   #7
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Default 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
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Old 22nd March 2003, 06:47 PM   #8
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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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Old 22nd March 2003, 07:04 PM   #9
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Default I thaugth there were a catch...

I actually tried to get hold of the SF - I2S option, when I had the SFT-1 Drive...

Time for a group-project for a universal I2S Tx/Rx..?

Arne K
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Old 22nd March 2003, 07:30 PM   #10
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It is better to built one box player, and if the box is not big enough, make power supply separate.
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