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Old 6th June 2003, 07:06 AM   #1
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Default Deriving I2S from Sony CDP

Here's the schematic of the DSP and digital filter section in my Sony CDP620 player. I'm trying to get I2S from DSP and connect it directly to TDA1543. I'm not sure if I used proper connection, as I got very week signal in left channel and noise in the right one. I made the following connections from filter pins (CX23034) to TDA1543:

pin 8 (BCLK) -----> pin 1
pin 7 (Data) -----> pin 3
pin 6 (WCLK) -----> pin 2 of TDA1543
plus I connected ground from Sony board to the TDA1543 chip.

Will it work?
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Old 6th June 2003, 07:26 AM   #2
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Lightbulb I2S from Sony chip

Hi Peter,
Very probably the signals coming from the DSP are not Philips I2S format but Sony/Burr-Brown format.
You can convert the Sony format to I2S by the schematic published by Kal Rubinson in the Audio Amateur 1, 1997.
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Old 6th June 2003, 07:30 AM   #3
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Would it be possible then, to connect the signals coming from DSP to AD1865 DAC maybe?
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Old 6th June 2003, 07:51 AM   #4
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Lightbulb AD1865

Hi Peter,
yes I did that in my old Sony as my first NON-OS experiment. Sound is too soft though as you are not using the two MSB bits . With the AD1865 actually you need some kind of zero stuffing scheme. Porobably also the reason Audionote is using the CS8414 in there CD-2 CDP. The 16 bit AD1851 gives normal output in the Sony but sounds worse than the AD1865.
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Old 6th June 2003, 09:29 AM   #5
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if it's in sony/bb format, why not trying non os with a BB DAC?
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Old 6th June 2003, 10:32 AM   #6
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Lightbulb BB-DAC

Quote:
Originally posted by Bricolo
if it's in sony/bb format, why not trying non os with a BB DAC?
Hi Bricolo, I did with the PCM56.
Bass was very good, highs were bad.
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Old 6th June 2003, 11:32 AM   #7
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Default Re: BB-DAC

Quote:
Originally posted by Elso Kwak

Hi Bricolo, I did with the PCM56.
Bass was very good, highs were bad.
due to what? the pcm56 don't like non os?
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Old 6th June 2003, 11:43 AM   #8
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Cool Re: Re: BB-DAC

Quote:
Originally posted by Bricolo

due to what? the pcm56 don't like non os?

Hi Bricolo,
I think it is due to the DAC. The PCM56 is a first generation DAC. The AD1851, also 16 bit, was a lot better overall.
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Old 6th June 2003, 11:46 AM   #9
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Default Re: Re: Re: BB-DAC

Quote:
Originally posted by Elso Kwak



Hi Bricolo,
I think it is due to the DAC. The PCM56 is a first generation DAC. The AD1851, also 16 bit, was a lot better overall.

from what i've undsetood on the "how does a delta sigma dac work?" topic, R2R seems better (no HF garbage) for non os

but on the manufacturer's sites, i can't see which one is r2r or d/s


which dacs are R2R?
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Old 6th June 2003, 12:08 PM   #10
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Default Re: Re: Re: Re: BB-DAC

Quote:
Originally posted by Bricolo



from what i've understood on the "how does a delta sigma dac work?" topic, R2R seems better (no HF garbage) for non os

but on the manufacturer's sites, i can't see which one is r2r or d/s


which dacs are R2R?
Well Bricolo, if you read the datasheets you will find that most manufacturers mention the kind of DAC
AD1851, AD1865, PCM56 are R2R
All Crystal/ Cirrus Logic are Delta-Sigma.
AD1853, AD1854, AD1855, AD1857, AD1858, AD1859 are all Delta-Sigma. Most Delta-Sigma DACs have built in (on chip) digital filter and are thus unsuitable for a NON-OS application.
I which catogory the TDA1543 & TDA1541 DAC belong I don't know
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