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Old 26th April 2008, 08:24 AM   #571
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Join Date: Sep 2007
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Quote:
Originally posted by RayCtech

What are the DAC switching frequency with these three conditions?
2.1. With 44.1k input and 40M clock?
2.2. With 44.1k input and 80M clock?
2.3. With 192k input and 80M clock?
Are this different with SPDIF and SERIAL input??

Raymond
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Old 26th April 2008, 10:58 AM   #572
NeoY2k is offline NeoY2k  France
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Flshzug: Ok, I'll start a new thread when I'll have finished the design.
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Old 26th April 2008, 05:42 PM   #573
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Hi again Dustin

I have also some questions regarding Register 11...

Register 11: Mode Control 2 (default=8'b10000101)
[4:2]: DPLL BANDWIDTH
3'b000 => No Bandwidth
3'b001 => Lowest Bandwidth
3'b010 => Low Bandwidth
3'b011 => Med-Low Bandwidth
3'b100 => Medium Bandwidth
3'b101 => Med-High Bandwidth
3'b110 => High Bandwidth
3'b111 => Highest Bandwidth
[1:0]: DE-EMPHASIS SELECT
2'b00 => 32 kHz
2'b01 => 44.1 kHz
2'b10 => 48 kHz
2'b11 => RESERVED

DPLL bandwidth have default the lowest bandwidth,
what changes when medium or high bandwidth are selected?

DE-EMPHASIS select are default set for 44.1 kHz and when register 10 [1] bypass_de-emphasis filter are changed to 0 this filter are in function.
If 44.1 kHz are upsampled to 192 kHz prior to this chip and the 44.1 kHz need de-emphasis, can the de-emphasis filter for 44.1 kHz in the chip be used??

Raymond
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Old 26th April 2008, 08:49 PM   #574
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Quote:
Originally posted by RayCtech
Hi Dustin

I have some questions I not have seen the answers for yet:

1. What are the minimum voltage levels the SPDIF input requires to work properly?

2. What are the DAC switching frequency - by that I mean switches the DAC output at 384k, 768k, 1536k or at some other frequecy?

What are the DAC switching frequency with these three conditions?
2.1. With 44.1k input and 40M clock?
2.2. With 44.1k input and 80M clock?
2.3. With 192k input and 80M clock?

3. Any register settings to change this??

Raymond

Hi Raymond,
1. The SPDIF input is just a CMOS input with shmidt trigger, so you really should use the comparator circuit to make the spdif input 0 to 3.3V

2. Switching frequency is XI/64. so
2.1 = 625kHz
2.2 = 1.25MHz
2.3 = 1.25MHz

3. No
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Old 26th April 2008, 08:54 PM   #575
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Quote:
Originally posted by RayCtech


Are this different with SPDIF and SERIAL input??

Raymond

Quote:
Originally posted by RayCtech
Hi again Dustin

I have also some questions regarding Register 11...

Register 11: Mode Control 2 (default=8'b10000101)
[4:2]: DPLL BANDWIDTH
3'b000 => No Bandwidth
3'b001 => Lowest Bandwidth
3'b010 => Low Bandwidth
3'b011 => Med-Low Bandwidth
3'b100 => Medium Bandwidth
3'b101 => Med-High Bandwidth
3'b110 => High Bandwidth
3'b111 => Highest Bandwidth
[1:0]: DE-EMPHASIS SELECT
2'b00 => 32 kHz
2'b01 => 44.1 kHz
2'b10 => 48 kHz
2'b11 => RESERVED

DPLL bandwidth have default the lowest bandwidth,
what changes when medium or high bandwidth are selected?

DE-EMPHASIS select are default set for 44.1 kHz and when register 10 [1] bypass_de-emphasis filter are changed to 0 this filter are in function.
If 44.1 kHz are upsampled to 192 kHz prior to this chip and the 44.1 kHz need de-emphasis, can the de-emphasis filter for 44.1 kHz in the chip be used??

Raymond


Hi Raymond,

No diffeference from SPDIF to serial input on DAC switching frequency,

If you choose higher bandwidth setting, the DPLL locks faster but lets more jitter through. Your tradeoff.

Can only use De-emphasis as the rate of the input. So basically the chip would have no knowledge that the data was origanally at 44.1k if you upsample prior. By no knowledge, I mean it doesn't have a timebase of 44.1kHz to clock the de-emphasis filter at, so it would just run the filter at 192k. Thus stretching its frequency responce accoring tot he ratio of 44.1k to 192k. So basically, it will be useless.


Thanks

Dustin
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Old 26th April 2008, 09:02 PM   #576
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Join Date: Apr 2008
Hi guys,

This is my first post but I have been following this thread since the beginning and I am really interested in this project. Can you please include me in the list for the first round of boards for the Buffalo?
I have a few questions though - I live in Bulgaria (Eastern Europe) and I was wondering which option I should choose -
Buffalo DAC Module, fully assembled: $129
or
Buffalo DAC Module/Dual Power Supply Combo: $169 -
or are these both required to get it working? I am planning also to include the IVY board so your advise is more than welcome.
I am sorry for the totally newbie questions which show absolute lack of understanding but I have some friends that are really experienced in the field and are willing to help with assembly and troubleshooting so please help. I just wanted to respond asap and not loose the opportunity to get it now
Thanks for the understanding.
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Old 26th April 2008, 09:32 PM   #577
agent.5 is offline agent.5  United States
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I like to get a SMC media streamer and hook it up to Buffalo. Can they be hooked up via I2S or do I need to order SPDIF too?
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Old 26th April 2008, 10:52 PM   #578
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Quote:
Originally posted by Nikola Krivorov
are these both required to get it working?
If you get the DAC/IVY combo it comes with the power supplies too, then all you will need are a couple of dual secondary transformers.

We have transformers available too. Or you can use any suitable transformer(s).

Cheers!
Riss
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Old 26th April 2008, 10:55 PM   #579
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Quote:
Originally posted by agent.5
I like to get a SMC media streamer and hook it up to Buffalo. Can they be hooked up via I2S or do I need to order SPDIF too?

The easiest way to do that is to mod the SMC media streamer so that you can take the SPDIF out. The Buffalo accepts SPIDF input directly. No other module is required.

Here is a thread that describes how:

http://www.diyaudio.com/forums/showt...96#post1250796

You can use Fuppes to serve up .flac transcoded to .wav.

Cheers!
Russ
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Old 26th April 2008, 11:57 PM   #580
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Oh, thanks for that answer, let it be the IVY combo then... I sent an e-mail to the addresses at the site too, please have a look. I have to use 220v though - is that OK?
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