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Old 8th February 2003, 04:01 PM   #11
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Hi jean-paul,

To work with a CS8412, I think I will need some circuitry (shift register and what else) to convert EIAJ to I2S format, but no idea how EIAJ looks like in the first place!

Quote:
But why do you want to use it in a CD63 ? That player has a good DAC chip in it !?!? If you persist on using it for non os purposes maybe you can make an external DAC with a CS8412 and a TDA1543. Saves you the hassle and the risk of damaging the CD63. The PCB material used is not exactly rugged in these machines.
Good point. Well, 8412 jitter is not that low right? Plus never like the idea of I2S convert to SPDIF, then convert back to I2S... I feel that it makes sense to bypass all this crap! Just I2S straight to TDA1543. Unfortunately, seems like I can't do so in my CD63. Hence, wanting to try TDA1543A.

Another reason for wanting to try out is that the 3 lines carrying WCLK, SDATA and SCLK from the SAA7345 terminate at a 220ohm resistor before going into the DAC. Thus, accessing these 3 lines is piece of cake. No need to cut any traces. Just lift one end of the resistors and take off!

Quote:
Probably it will simply work when you connect it to the SAA chip. I guess it is a case of trial-and-error. Dangerous theory, I know
That's right. Kind of risky, that's why I'm finding out whatever info I could... I guess if I can't find anything, might as well try...

Wish me luck!

DonJuan
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Old 8th February 2003, 05:41 PM   #12
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I wish you luck, DonJuan ! BTW you can reclock the signal of the CS8412 to make jitter lower.

Jean-Paul
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Old 10th February 2003, 10:03 PM   #13
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Quote:
Originally posted by DonJuan
Good point. Well, 8412 jitter is not that low right? Plus never like the idea of I2S convert to SPDIF, then convert back to I2S... I feel that it makes sense to bypass all this crap! Just I2S straight to TDA1543. Unfortunately, seems like I can't do so in my CD63. Hence, wanting to try TDA1543A.

Why not? A 17 bit shift register on the data line is about you need.
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Old 11th February 2003, 12:15 AM   #14
Nisbeth is offline Nisbeth  Denmark
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Default TDA1543N ???

Pardon me for butting in with a few questions of my own, but what's the difference between 1543N and 1543? Can it be used with the CS841X for the DAC-project mentioned in another thread? Only asking because a German online retailer sells the 1543N for 0.60 Euro/pcs, which seems cheap to me... Also, what is the difference between 8412 & 8414 (in this application) ?

TIA!

/U.
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Old 11th February 2003, 03:26 AM   #15
Pedja is offline Pedja  Serbia
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Hello Nisbeth,

See
http://www.audioasylum.com/scripts/t...tweaks&m=75946

Pedja
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Old 11th February 2003, 11:12 AM   #16
Nisbeth is offline Nisbeth  Denmark
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Pedja, does this mean I can use the 1543 that Reichelt sells for the DAC without problems?

/U.
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Old 11th February 2003, 03:04 PM   #17
Pedja is offline Pedja  Serbia
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Yes Nisbeth. I still did not solder it, but I don't expect any problems.

Pedja
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Old 17th February 2003, 12:55 AM   #18
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Default It works!

Hi!

jean-paul said:

Quote:
I wish you luck, DonJuan ! BTW you can reclock the signal of the CS8412
Well, guess what? I tried tapping the I2s signal from my CD63 and found that with the TDA1543A, I get a buzzing sound. Definitely not right. I was dissappointed as I was told that the signal format from the SAA7345 is Japanese input and TDA1543A is supposed to work with Japanese input. But it doesn't work!

Anyway, since I have nothing to lose, I plugged in a TDA1543 and... lo and behold! I could hear music!

So the SAA7345 output is I2S after all!

Damn cheap non-oversampling DAC!

This opens up lots of opportunities. I believe you can fit in a TDA1541 there and you'll be smoking!

Current plan I have is to optimize this circuit (it needs a gain stage), then drill 2 holes on the chassis to accomodate output RCA jacks. This way, I have 2 DACs in one chassis.

DonJuan
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Old 17th February 2003, 11:33 AM   #19
rbroer is offline rbroer  Netherlands
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DonJuan,

how do you know the output of the SAA7345 is non oversampled, that is 1*fs/16 bits and not oversampled like 4*fs 16 bits ?
Did you measure the BCK frequency ?
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Old 17th February 2003, 11:42 AM   #20
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Exclamation SAA7345

Quote:
Originally posted by rbroer
DonJuan,

how do you know the output of the SAA7345 is non oversampled, that is 1*fs/16 bits and not oversampled like 4*fs 16 bits ?
Did you measure the BCK frequency ?

Hi All,
To put it more bluntly, the datasheet indicates a 2 to 4 times oversampling integrated digital filter.
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