DAC-will this work?

darkfenriz · 7th February 2007, 05:29 PM

Hi
I have a question about a spdif DAC design using dir1703 and tda1543.
Can I build it like this:(attached)
Is it right to select "16bit msb first right justified" and 128fs?
If it is not, then is it possible to build a dac from these chips only?

kind regards
Adam

ash_dac · 7th February 2007, 06:02 PM

Quote:

Originally posted by darkfenriz
Hi
I have a question about a spdif DAC design using dir1703 and tda1543.
Can I build it like thisattached)
Is it right to select "16bit msb first right justified" and 128fs?
If it is not, then is it possible to build a dac from these chips only?

kind regards
Adam

This dir1703 chip has a 24bit I2S output mode.

Well I assume it's I2S but it's listed as IIS! (I haven't looked at the timing diagram though)

Not sure about 128fs....

darkfenriz · 7th February 2007, 08:20 PM

Why should I use 24 bit output mode from spdif receiver if tda1543 is 16 bit DAC?
I think I should choose 128fs, because maximum frequency at clock input of tda1543 is only 9.2MHz, is that right?

rfbrw · 7th February 2007, 08:23 PM

Quote:

Originally posted by darkfenriz
Why should I use 24 bit output mode from spdif receiver if tda1543 is 16 bit DAC?

Because you have no choice as far as the '1703 is concerned. In I2S mode it always assumes 24bit data. The TDA1543 will ignore the excess bits.

darkfenriz · 7th February 2007, 09:25 PM

I understand, yes, that's the only i2s mode and is marked IIS. Thanks to both of you.
Another question: what crystal should I use? can it be 12.3Mhz?

darkfenriz · 8th February 2007, 06:49 PM

Corrected receiver/dac
(FMT pins connected to HIGH)

darkfenriz · 8th February 2007, 06:55 PM

How I'd imagine spdif input

darkfenriz · 8th February 2007, 07:13 PM

Simple and not very sophisticated IV stage with analog interpolation in attachment.

I would again invite the experts to comment, I am a true novice to DAC design and do not want to burn much silicon.

regards

ezkcdude · 8th February 2007, 08:27 PM

Why are you using TDA1543? It's not a NOS design, since you have the DF. I just don't get it. AFAIK, the only reason to use TDA1543 is for NOS designs. It's not as if the specs of TDA1543 by themselves are so great.

darkfenriz · 8th February 2007, 10:39 PM

DF ?
What do yuo mean by this abbreviation?

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7th February 2007, 08:20 PM	#3
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Why should I use 24 bit output mode from spdif receiver if tda1543 is 16 bit DAC? I think I should choose 128fs, because maximum frequency at clock input of tda1543 is only 9.2MHz, is that right?

7th February 2007, 09:25 PM	#5
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	I understand, yes, that's the only i2s mode and is marked IIS. Thanks to both of you. Another question: what crystal should I use? can it be 12.3Mhz?

8th February 2007, 08:27 PM	#9
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Why are you using TDA1543? It's not a NOS design, since you have the DF. I just don't get it. AFAIK, the only reason to use TDA1543 is for NOS designs. It's not as if the specs of TDA1543 by themselves are so great.

8th February 2007, 10:39 PM	#10
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	DF ? What do yuo mean by this abbreviation?

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