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Old 8th October 2008, 06:14 AM   #1
borges is offline borges  Norway
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Default S/PDIF receiver recomendation

I'm considering to add a digital input to my CD player project. I haven't done any work in this field since the CS8412, which kind of inspired me to do away with the whole S/PDIF input.

What are the current trends in this field? What are your experiences?

My project uses an 192x MCLK generated on the DAC board to read standard 44.1/16 from a CD drive. I use an FPGA to implement a custom 8x interpolator on top of that.

So I'd like to keep up with this clocking scheme. Is asynchronous reclocking the way to go? What is a reasonable output frequency? 44.1 or 88.2 over i2s would fit well with the rest of the design.


Thanks,

Borge
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Old 8th October 2008, 05:12 PM   #2
kevinkr is offline kevinkr  United States
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Default Re: S/PDIF receiver recomendation

Quote:
Originally posted by borges
I'm considering to add a digital input to my CD player project. I haven't done any work in this field since the CS8412, which kind of inspired me to do away with the whole S/PDIF input.

What are the current trends in this field? What are your experiences?

My project uses an 192x MCLK generated on the DAC board to read standard 44.1/16 from a CD drive. I use an FPGA to implement a custom 8x interpolator on top of that.

So I'd like to keep up with this clocking scheme. Is asynchronous reclocking the way to go? What is a reasonable output frequency? 44.1 or 88.2 over i2s would fit well with the rest of the design.


Thanks,

Borge
Can't answer the other questions, but the Wolfson WM8804 is a very solid performer which I use in my own dac. Probably pretty close to SOTA at the moment in commodity spdif receiver chips.
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Old 9th October 2008, 07:26 PM   #3
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a number of people (myself included) like the SRC4392 from TI. This provides ASRC as well.

I'll let you know how it works when I've built it up.

BTW I believe ASRC is the way to go to to deal with S/PDIF regurgitated clock issues.
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Old 12th October 2008, 10:09 AM   #4
borges is offline borges  Norway
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Thanks guys.

Do you know how wise it is to convert incoming digital audio to 44.1/16? Anybody out there having tested these devices at this rate?

The reason is that the rest of my system is designed to handle I2S from a CD drive. I'm using a custom 8x interpolator in an FPGA.

Now I keep getting the feedback that digital in would be a good idea for my CD player. Managing input data at different sampling rates (and resolutions) would be quite a hassle.


Cheers,
Borge
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Old 12th October 2008, 06:06 PM   #5
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...not to mention problems with sync'ing multiple clocks.

My system is a DSP based crossover design running at 48KS/s. I had the same problems of accepting S/PDIF at multiple rates and this is exactly why I chose the SRC4392 over a plain CS8416 receiver.

Sample rate conversion is fine as long as it's done well (filter design is critical) I read somewhere that jitter can be a problem on asynchronous SRC's as these systems are sensitive to the phase of the input and output clocks. This will be something to test.

As I say, I haven't tried it yet. The PCB should arrive is a week or so and I have all the parts. Stay tuned...
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Old 13th October 2008, 07:42 AM   #6
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HI

The PCB should arrive is a week or so and I have all the parts

Tell us more

This PCB can replace a CS8414 or a CS 8416 to connect it to a TDA 1543 or TDA 1545 .

Serge
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Old 13th October 2008, 08:50 PM   #7
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it has it's own thread here
S/PDIF to SPORT receiver PCB

apologies to this thread for being a p-w
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Old 14th October 2008, 07:32 AM   #8
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Do you sell your PCB Assembled and Tested ?
I am very interesting .

Serge
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Old 14th October 2008, 03:54 PM   #9
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Sorry for hijacking your thread, Borges. My intention was to share my current research in this area.

Sergelisses - send me an email
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Old 14th October 2008, 06:54 PM   #10
borges is offline borges  Norway
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Quote:
Originally posted by Iain McNeill
Sorry for hijacking your thread, Borges. My intention was to share my current research in this area.
Don't worry about it at all! I started a new thread on digital XO design
here .

Cheers,
Borge
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