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Old 18th April 2004, 09:04 PM   #31
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Smile Thanks Peter

I will study this carefully.

But take a look at the pictures, it is written TDA1541/S/N2.

The datasheet names S1 as TDA1541 N2 S1, and so does my billing from the S1 I bought if I recall that right.
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Old 18th April 2004, 09:33 PM   #32
guido is offline guido  Netherlands
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Quote:
Originally posted by Bricolo
The Left and Right channels are separated, so it's not vanilla IIS but maybe some sony format.

What I don't understand is how they get one chip to output L+ L- (or R+ R-) , especially with the DAC configured for IIS input

You'll also notice that even here, BCK is connected to SCK. And even more: pin 4 is reffered as SCK, on this player designed for a TDA1541A


Maybe some pre-processing is done in the digital filter, to send some tata when WS=0, and the 2's complement of the same data when WS=1

The FF only seem to be some synchronous reclocking or WS and Data, synchronously to BCK.
Guys please: pin 27 is connected to 28. It IS I2S for the TDA. That it gets +left and -left, it is unaware of. It just converts whatever comes in. Sounds very familiar to me

The dig filter must be configured to split i2s and feed +l/-l and +r/-r to the dacs. There is no other way this would work.

Pin 4 is strange. SCK does not exist on A version, so it is no use to put crap onto that pin.

More interesting that this, is that the -5 is made from the -15 and not from a separate supply. It makes sense, if you read the post in the digital section.

gr
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Old 18th April 2004, 09:34 PM   #33
guido is offline guido  Netherlands
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Quote:
Originally posted by Peter Daniel


I still don't know how to split data into right and left channels.
Why not, the info is available in the digital section..
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Old 18th April 2004, 09:37 PM   #34
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I wasn't following that topic lately, that's why I guess

Which thread exactly? Not the one you started a year ago, or so?
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Old 18th April 2004, 09:48 PM   #35
guido is offline guido  Netherlands
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Quote:
Originally posted by Peter Daniel
I wasn't following that topic lately, that's why I guess

Which thread exactly? Not the one you started a year ago, or so?
It is longer than that and i did not start it. Called 2 TDA1541A in the digital section. Splitting works well.

However, thanks to HtP in the tda1541 info post, i now know that things can be done better around the 1541 (dem reclock, PS, I2S signals etc). So i'm gonna check that out with a new dac with only one 1541 first.

As for this old post: the GAL definitions can be done simpler (mentioned in other posts, seatch for 'GAL' and there is one improvement on the schematics (not tested yet):

pin 1 from the GAL (clock) should be connected to the 11MHz with an inverter to remove the jitter introduced by the '161 on BCK.

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Old 18th April 2004, 10:21 PM   #36
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Quote:
Originally posted by guido
Splitting works well.
@ the moment I would be more interested in splitting the signal into +r/+r and -r/-r.

2 chips for each channel.

My listening impressions so far:

SAA7220A + TDA1541A:

Strong odd order harmonics and suppressed even orders
Sounds

SAA7220A +TDA1541:

All harmonics distributed evenly, low distortion
Sounds detailed and clean.

SAA7220B + TDA1541(A):

Very good values for K2/K3, but dominating K5
Sounds clinical, narrow and dry.

TDA1541(A) non os:

Medium distortions, but mostly evenly distributed, suppressed K9 & tendential stronger low orders.

Sounds very open & relaxed due to rich harmonics, a little bit watered though.
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Old 28th April 2004, 09:54 AM   #37
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Quote:
Originally posted by jean-paul


Exactly, this is not standard I2S. CD 7 does not use a standard digital filter but a specially programmed DSP.

Jean-Paul, do you know if the 1541s in the CD7 are used as non-os, 4*os or 8*os?
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Old 28th April 2004, 08:45 PM   #38
guido is offline guido  Netherlands
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Not JP, but i can answer this too:

It says: i2s format, 16 bit word, 4fs data

So 4 times oversampling.

It also says
D/A conversion 1-bit linear/channel

mvg,
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Old 2nd May 2004, 07:08 PM   #39
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Another S1 here:

http://cgi.ebay.de/ws/eBayISAPI.dll?...tem=3093983492
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