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Old 29th October 2012, 02:41 PM   #4561
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Phisci View Post
Hi all, I am planning to run the I2S out from CS8412 to a PCM63 dac. Has this forum decided on the best way to glue the I2S output to a 2's complement DAC? I've seen 74HC176 used as a shift register, but have seen alternative arrangements as well.

Some q:
1. Can data be sent straight through from cs8412 to PCm63?
2. If so, would you then invert BCK with a 74HC04 while passing LE/WordCK through 2x HC176?

Thanks guys!
I thought this forum was "building-ultimate-nos-dac-using-tda1541a". Maybe we have a forum called "building-ultimate-nos-dac-using-PCM63" ?

Why don't you have a look at the TDA1541A specs. I think it's 2's comp device, so you should be able to push clock, latch and data signals straight in, if timing diagrams show they are the same.
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Old 29th October 2012, 03:29 PM   #4562
Phisci is offline Phisci  South Africa
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roger57, TDA1541 is not a 2's complement like PCM63 is. IIRC, TDA1541 is offset binary. Just looking for a real-life implementation of I2S to 2's complement from someone who's "been there, done that"
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Old 29th October 2012, 08:31 PM   #4563
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Hi Phisci,

Quote:
1. Can data be sent straight through from cs8412 to PCm63?
More information on this subject can be found here:

Cs8412 - Pcm63 Non-oversampling
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Old 30th October 2012, 04:11 AM   #4564
Art is offline Art
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Hi Phisci,
I2S is 2's complement. TDA1541A can accept both 2's complement and offset binary. PCM63 accept only 2's complement. There is no problem.

Sorry for off-topic, everyone.
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Old 30th October 2012, 05:57 AM   #4565
Phisci is offline Phisci  South Africa
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Thanks for the input guys
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Old 30th October 2012, 08:31 AM   #4566
SSerg is offline SSerg  Russian Federation
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Hi, -ecdesigns-

Quote:
Originally Posted by -ecdesigns- View Post
Direct interpolation was abandoned
At early posts you declared that "hearing is believing!", and you have chosen DI. Now you abandoned to DI. What happened to your hearing?

Serg
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Old 30th October 2012, 11:42 AM   #4567
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Dear SSerg,

I don't think your last post contributes to anything at all...

Sincerelly yours,
M.
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Old 30th October 2012, 06:00 PM   #4568
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Quote:
Originally Posted by -ecdesigns- View Post

I attached an oscillogram showing my mains voltage when interference levels are lowest. Most irritating interference is the approx. 2.5 KHz signal riding on the mains.

Next oscillogram shows the 11.2896 Mhz output signal. It's a pure sine wave with very low distortion (fundamental).
Dear EC,

why don't you use a spectrum analyzer ?
How can you visually inspect a sinewave on a scope and claim it has - very low - distortion ?
Same with your 2,5 kHz problem. Why not make a scan 20 Hz to 20 kHz ? It will tell everything.

Not so long ago, - extremely low - jitter proved with 60 MHz Hameg...

Many other things I can not understand, one example, you dropped the DI because hf roll off. But what about the nonos hf roll off ?
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Old 31st October 2012, 01:40 PM   #4569
SSerg is offline SSerg  Russian Federation
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Quote:
Originally Posted by maxlorenz View Post
I don't think your last post contributes to anything at all...
Dear colleague,

I don't at all try to poke fun at author of the thread in no event. On the contrary, many EC ideas are close to me. I just try to understand at evolutions of his preferences, at dignities and defects his design.


Sincerely yours,
Serg
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Old 31st October 2012, 08:51 PM   #4570
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Quote:
Originally Posted by SSerg View Post
Dear colleague,

I don't at all try to poke fun at author of the thread in no event. On the contrary, many EC ideas are close to me. I just try to understand at evolutions of his preferences, at dignities and defects his design.


Sincerely yours,
Serg
OK.

I think -EC- has explained each and every step he has chosen.
Beside, change in opinion in front of new experiences is sign of a healthy mind. I'm sure we all had an old love that seemed the nec-plus-ultra of beauty and other desirable traits, until a new beloved one de-throned her...
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