Cs8412 - Pcm63 Non-oversampling

maartentje said:

Hi Guys,

If i use this schematic and use a Pcm63 instead of Pcm56 will it works?
And then is it non-oversampling right?
Something like peter van willenswaard?

Thnx Maarten

Click to expand...

Yes but see here http://www.diyaudio.com/forums/showthread.php?s=&threadid=61278&highlight=

I have also a CS8414 and 2 PCM56 waiting here to be used, so when you succesfully finisch the job i'll be very interested in your results. But first i want to finish my own digital project with 1541's

It seems that very few people are interested in this topic but I am working on a NOS DAC using PCM63 chips.

Here is the PCB design on three separate boards.

Bottom layer (top view)

Top layer

Hello, I would buy 6 sets if you goin to sell these. Please write details below , or send msg, my email is: readswift ~at~ gmail . com
thanks

Hi Hachiman

Thanks for your interest. I will email you later. It's probably too early to talk about selling now.

I will post some details of the design tonight. I am still reviewing design of the digital section. The digital section combines various design ideas from many sources.

Cheers

Great QuanTran,
I will follow you.
Tks

Here is the block diagram.

Hi mailinh,

Nice to see you here.

very good. I have 3 pulse transformers from an old AES/EBU interface. Goin to look for more. Can we use AES input and CS8416 too?

Yes , AES/BEU interface with XLR connector is possible according to the attached drawing.

CS8416 is a totally different chip so no. The design is compatible with CS8412 and CS8414 only.

As CS8412/4 is originally not compatible with PCM63 in NOS mode, we need to process the output signal from the receiver chip to make it work with PCM63.

The attached diagram shows the data processing method.

This image gives a better view of the PCBs.

I am working with the prototype and having a strange problem.

I use a half of 74hc74 to reclock FSYNC. Clock frequency is 2.8224mhz. Left chanel work flawlessly. Then I use Q_bar output from this 74hc74 for right chanel LE. There is some repeated static noise on the right chanel. Music on the righ chanel is still very clear. I can't understand this. I know that Q_bar may be delayed slightly compared to Q but it shouldn't be that much to cause a problem.

I post the schematic below. Hopefully someone can help me.

Do I need a faster logic chip? The one I use is SN74HC74 branded TI

Hi Quantran,


Did you use socket ?
that might cause it, I had exactly the same problem with PCM63 before
because of socket and dirty PCB.

regards,
Hartono

Hi Hartono

Thanks for your response.

Yes, I use sockets for both pcm63 and 74hc74. There is also a 5 wire connector (very short) from 74hc74 to PCM63.

I will try to solder the 74hc74 to the PCB.

I have soldered the 74hc74 directly to the PCB. The result is the same i.e. still got noise. Aslo I have tried to feed the right channel PCM63 with LE of for left channel; the pcm63 of right channel process this signal perfectly. Definitely there is something wrong with the LE for right channel.

LE for left channel if Q from 74hc74 and LE for right channel is Q_bar from the same chip.

Perhaps I will try to reclock Fsync with higher clock rate e.g. 11.2896mhz.

This means running the DAC in mono; both channels of the DAC output left channel of the source data. Level of detail is amazing!!!

Hopefully I can get right channel to work.

quantran said:

Also I have tried to feed the right channel PCM63 with LE of for left channel; the pcm63 of right channel process this signal perfectly.

Click to expand...