Please Help Me make an SPDIF out for my SONY CDP deck

[marios_mar]

Please Help Me make an SPDIF out for my SONY CDP deck

Happy new Year to everybody here at DIYAUDIO!!


I have a SONY medium sized deck model CDP-M205 (Ive heard it was never sold in the US) and I’ve decided to upgrade my sound by adding an external DAC.(Maybe a modded ART DI/O tube DAC). The CDP doesn’t have any form of digital out though. So I want to make an SPDIF out. I don’t care about utilizing the CDPs DAC anymore. I want to use it just as a transport. Other kinds of modification will take place of course later on such as dampening etc. I wrote down the chip numbers that I found on the printed circuit on the bottom side of the CD drive (since that’s where the interest is in this case)

CXA1992AR
CXD2529Q
BE5941F (Is this the actual DAC?)

I saw an old post here at DIYaudio where some guy had another Sony CDP and someone told him that if he pulls high pin 59 on the CXD2500Q chip then pin 60 can be SPDIF out.
Here’re some quotes
“The digital out is pin 60 on the CXD2500Q.
You have to pull pin 59 high to enable digital out. Just connect pin 59 to +5V. This may be tricky as it is probably soldered to ground.
….The output at pin 60 is not I2S but SPDIF format ready to go to the SPDIF output. (Digital out)”

Ive been wondering if theres something similar that could be done on my CDP.
Please if you have any ideas or thoughts post them.

Thanks In advance. I hope I hear from you, I think this is my second post here?

[marios_mar]

So I found the data sheet .(I entered the name of the IC on yahoo and pressed enter- there i got it) there is a Digital Out output at pin 71.

What kind of digital out would that be?

And If I want to use a comercial DAC with coaxial in what would it take to take the signal from this particular chip and take it to the DAC?

Please help me!

[rfbrw]

It should be a standard SPDIF output. You can test to see if it has been enabled by connecting it to a device with an electrical SPDIF input.

[marios_mar]

How would I do that. SPDFI is coaxial. So the center poin should be connected to the pin 71. What about the ground. Where should I connect the coaxials ground?
Any ideas.


Thanks for posting.

BTW. if it was SPDIF shouldnt it say so in the data sheet?

[rfbrw]

First find out if the output is enabled by testing it and then worry about the rest. My CD player uses the chassis for GND.

[cm]

Forget about SFDIF. Use I2S direct by using my EIAJ to I2S converter. See my thread on sharing my digital work. You should be able to get the circuit from the description.

POr you can just use the TDA1543A. Since you ahve the datasheet finding the three signals would not be difficult.

CM

[marios_mar]

The thing is I dont yet have a Dac to test if SPDFI is enabled?

What is the deal with using the I2s? What is better with the TDA1543A?

I would do that CM and Ive seen some relevant threads but the thing is that the designations for the pins are mabe named differently at my chip? I dont know which are the correct pins.

Please could someone take a look at my data sheet (the first page that will come when you enter the chip name on yahoo) and help me find the pins.

All ideas are welcome.

[rfbrw]

See page 47 of the datasheet.
TDA1543A uses the Sony format shown on pg 47.
TDA1543 uses the Philips I2S format.
Pin50 LRCK L/R data clock
Pin52 PMCD Serial audio data
Pin54 BCK Serial clock

[marios_mar]

ok thanks for looking at the data sheet too.


As youve realized I am no electronics specialist. I am sort of a beginner especially in terms of digital stuff.

So say I connect those 3 pins to the corresponding pins of the TDA1543A chip. Do I get two pins of the TDA1543A that give out analog signal to feed my amp? Or is the TDA1543 going to be a part of a new circuit? And if so what is that circuit (example maybe?)

Having seen my manual would this digital out be enabled and hat kind of digi out would it be? I would be interested in feeding an ART DAC with coax in.

Also Ive noticed (by practising on the chip of an old broken modem) that it is pretty hard to solder onto these little pins of the chip. It would be very good if you could give me some advice on this. It is much more difficult than soldering an opamp or something. Any special tricks?


And lastly where do I get this TDA1543A from? Is there somewhere online to get it from? How much does it cost?

[marios_mar]

If someonw could answer this too--> Is there a way to put a coax out from my Sony?