XO DAC by Guido Tent

[joeling39]

Hi,

I am interested to know how one can connect the XO DAC to an Audio Note DAC 1.1. I have noticed that pin 19 (MCK) of the CS8412 within the DAC is not connected to anything. Pin 12 (SCK) goes direct to the CLK of the DAC chip (AD 1865). My guess is that one should connect the output of pin 12 to the input of the XO DAC and the output of the XO DAC to the input of the DAC chip. Could someone assist to clarify this ?

What should be the frequency of the XO DAC for use with the above application ? (11...Mhz ?)

Thank you.

Regards,
Joe LG

[A 8]

Don't know anything specifically about this dac but it looks like it has a clock already (the metal can thing)
So just figure out how it is connected and change it to Guido's

[jean-paul]

Or ask Guido if you're not sure what to do. He is a member of this forum.

[joeling39]

Hi,

Thanks for your suggestions. Guido has already replied to me privately. It is as what I guessed earlier except that the clock frequency needs to be 2.8224Mhz.

Regards,
Joe LG
Malaysia

[Guido Tent]

Originally posted by joeling39
Hi,

I am interested to know how one can connect the XO DAC to an Audio Note DAC 1.1. I have noticed that pin 19 (MCK) of the CS8412 within the DAC is not connected to anything. Pin 12 (SCK) goes direct to the CLK of the DAC chip (AD 1865). My guess is that one should connect the output of pin 12 to the input of the XO DAC and the output of the XO DAC to the input of the DAC chip. Could someone assist to clarify this ?

What should be the frequency of the XO DAC for use with the above application ? (11...Mhz ?)

Thank you.

Regards,
Joe LG

Hi Joe

Yes, We already had Email contact and yet figured out a sollution

XO DAC is quite new so I'll need to work on specific implementations, especially the NOS ones.....

To clarify matters: This is not a DAC, it is world first real clock improvement for PLL based DACs...........

succes

[joeling39]

Dear Guido,

Thanks for your information. With that, I was able to make firm arrangements with Brian Cherry at DIY HIFI Supply.

Hmmm, what if I combine this with Elso's asynchronous reclocking ? Something to work on for the rest of this year

Regards,
Joe LG

[capslock]

Hi Guido,

is there an internet page for the XO DAC already?

Groetjes,

Eric

[Elso Kwak]

Hi Joeling,
Being somewhat confused about this thread I made this title of my post.
The NON-OS DAC regardless if it is TDA1543/TDA1541/AD1865 does NOT use the masterclock provided by the CS8412. It is simply not used. But you can use Guido Tents inputreceiver with the extra PLL and VCXO (short for voltage controlled crystal oscillator) and use the lower jitter clock to reclock DATA, LATCH and BITCLOCK. Guido T. please correct me if I am wrong. The schematics are very hard to read for my old eyes and quite complicated for a simple soul like me.....
For a example how to implement the Asynchronous Reclocker in a NON-OS DAC see
http://home.student.utwente.nl/f.s.b...dio/nonoz.html
Guido Tent's DAC can be found here:
http://members.chello.nl/%7Em.heijli...chematics.html
Asynchronous reclocking is much more simple as it doesn't need a PLL and associated circuitry and the crystal oscillator may have lower jitter.
Please don't get carried away, a "one box" solution placing the DAC in the CDP, omitting the CS8412, but retaining the ASR sounds a whole lot better!
For those struggling with FIFO's the ASR can be seen as a very short FIFO. With the two flip-flops in series no dropouts (metastables) are seen on the scope during a 15 minute period. That's long enough for me.