non-oversampling DAC project

rmihai · 12th April 2005, 07:07 PM

Hi all,

I would like to build my own DAC. The problem is that I have certain requirements and I cannot find anything that fits. Maybe you can help me.

- 16-bit 96-khz I do NOT want more or less
- non-oversampling!

Please let me know.

Thank you

rfbrw · 12th April 2005, 07:25 PM

Quote:

Originally posted by rmihai
Hi all,

I would like to build my own DAC. The problem is that I have certain requirements and I cannot find anything that fits. Maybe you can help me.

- 16-bit 96-khz I do NOT want more or less
- non-oversampling!

Please let me know.

Thank you

Do you have a source of 16bit 96K data? If not and you only have native 24bit 96K data i.e. 24bit off the disc (DAD,DVD-A) as opposed to out of a digital filter then you will have to truncate 8 bits, a less than ideal situation.

rmihai · 12th April 2005, 07:40 PM

I will be using this DAC for DVD-player as well for CD's. As long as I know DVD's are 16/96 and CD's are 16/44.1. Am I wrong? I do not care about DVD-audio or SACD. If I really want hi-res I do have my turntable rig.

rfbrw · 12th April 2005, 08:08 PM

LPCM on DVD is 24/96. Some players downsample this to 24/48 or possibly lower.

rmihai · 12th April 2005, 08:35 PM

Oh, I see - I didn't knew it. Sorry and thank you for explanations.

Then I need:
- 24bit/96khz NON-oversampling kit.

Thank you once again.

rfbrw · 12th April 2005, 09:13 PM

The PCM1704 is the most obvious choice of DAC. As it is mono you will need two. You'll also need an input receiver. AKM and Crystal make suitable devices. The Crystal CS8416 will do. The circuit linking the rx to the dacs can be found here, http://www.geocities.com/nonospcm1704/
As for the analogue output stage, the choice is yours. Some use opamps, some discrete transistors, be they bjt, jfet or mosfet, others use a transformer and or a resistor. As good a place as any to start is the output stage from the Passlabs D1 dac.
http://www.passlabs.com/downloads/ol...t/d1_servm.pdf
D1 I/V Stage Finished.

gmarsh · 12th April 2005, 10:15 PM

16/96 Non-OS, eh?

If you feed it with 48kHz DVD audio and the DAC *has* to run at 96kHz, then you're technically 2x oversampling... If you feed it with 44.1KHz CD audio and the DAC is running at 96KHz, then you're 2.177x oversampling.

So, do you want the DAC frequency to scale with the input frequency, or do you want the DAC running at 96KHz all the time? The latter will require either an interesting combination of PLL and DSP, or a local clock and a ASRC chip.

rmihai · 12th April 2005, 10:47 PM

Indeed my requirement is what I inputin the DAC that will output. So, if I listen to CD"S AND the input is 44.1 my requirement is that the output to be the same.

12th April 2005, 07:07 PM	#1
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	non-oversampling DAC project Hi all, I would like to build my own DAC. The problem is that I have certain requirements and I cannot find anything that fits. Maybe you can help me. - 16-bit 96-khz I do NOT want more or less - non-oversampling! Please let me know. Thank you

12th April 2005, 10:47 PM	#8
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	the Indeed my requirement is what I inputin the DAC that will output. So, if I listen to CD"S AND the input is 44.1 my requirement is that the output to be the same.

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12th April 2005, 07:40 PM	#3
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	I will be using this DAC for DVD-player as well for CD's. As long as I know DVD's are 16/96 and CD's are 16/44.1. Am I wrong? I do not care about DVD-audio or SACD. If I really want hi-res I do have my turntable rig.

12th April 2005, 08:08 PM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	LPCM on DVD is 24/96. Some players downsample this to 24/48 or possibly lower.

12th April 2005, 08:35 PM	#5
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	Oh, I see - I didn't knew it. Sorry and thank you for explanations. Then I need: - 24bit/96khz NON-oversampling kit. Thank you once again.

12th April 2005, 09:13 PM	#6
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The PCM1704 is the most obvious choice of DAC. As it is mono you will need two. You'll also need an input receiver. AKM and Crystal make suitable devices. The Crystal CS8416 will do. The circuit linking the rx to the dacs can be found here, http://www.geocities.com/nonospcm1704/ As for the analogue output stage, the choice is yours. Some use opamps, some discrete transistors, be they bjt, jfet or mosfet, others use a transformer and or a resistor. As good a place as any to start is the output stage from the Passlabs D1 dac. http://www.passlabs.com/downloads/ol...t/d1_servm.pdf D1 I/V Stage Finished.

12th April 2005, 10:15 PM	#7
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	16/96 Non-OS, eh? If you feed it with 48kHz DVD audio and the DAC has to run at 96kHz, then you're technically 2x oversampling... If you feed it with 44.1KHz CD audio and the DAC is running at 96KHz, then you're 2.177x oversampling. So, do you want the DAC frequency to scale with the input frequency, or do you want the DAC running at 96KHz all the time? The latter will require either an interesting combination of PLL and DSP, or a local clock and a ASRC chip.

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