One clock for CDM12 Pro2 and Nos Dac TDA1545

[QSerraTico_Tico]

Originally posted by Vikt0r


Wrong!
It's the TDA1543 which has versions A/non-A with EIAJ/I2S interfaces respectively. The TDA1545 only comes in A version, with i2s only.

Huh, I would swear TDA1545A is NON I2S....
"compatible with most Japanese inputs formats" the datasheet says.

[Vikt0r]

Impossible, for the reason that I have a hand-built NOS DAC using TDA1545A and STA120 (similar to CS8414), and it's definitely in i2s... The STA does not even know WTF is EIAJ

[rfbrw]

[hollowman]

Originally posted by QSerraTico_Tico
Huh, I would swear TDA1545A is NON I2S....
"compatible with most Japanese inputs formats" the datasheet says.

The issue of which Philips TDA DAC chip accepting certain input formats is confusing. Here, e.g., are two posts mixed with (=conflicting) opinions on Philips TDA chips and the input formats each potentially accepts (I think the poorly-worded language in the datasheets are mostly to blame):
http://www.pinkfishmedia.net/forum/s...18&postcount=2
EIAJ to I2S converter and vice versa

Anyone care to take a stab:

TDA1543
TDA1543A
TDA1545
TDA1545A
TDA1541
TDA1541A

[rfbrw]

How I do lament the passing of the good old days when you had to at least have a passing acquaintance with the topic at hand before you were allowed even a sniff of a datasheet not least because they came in 1000 page tomes and you had to ask for them. That everyone and his dog is allowed access these days does not change the fact that these are specialist publications and some prior knowledge is assumed. Perhaps next time I feel a little discomfort and wish to self-diagnose I should go wailing to the medical authorities about the excessive use of latin and compound words in their texts.

[gochtoni_toni]

Thank you for reply

The tda1545 "A" or not, only accepts EIAJ

[rfbrw]

Originally posted by hollowman


Anyone care to take a stab:

TDA1543
TDA1543A
TDA1545
TDA1545A
TDA1541
TDA1541A

As soon as you take a stab at reading and understanding the respective datasheets.

[QSerraTico_Tico]

TDA1545(A):
What is difference on TDA1545 and TDA1545A?

[riotubes]

Toni,

The board layout in your post #6 is my implementation of John's schematic. John would have, undoubtedly, built it better.

For this implementation, the master clock (on this board) sits in the DAC box proximate to the dac input pins. It sends the master clock back to the transport; in this case a squeezebox 2. The SB2 outputs left justified format, not I2S. Hence, there is add'l complexity on the board you referenced (unnecessary for those with transports that output i2s) to convert the left justified format to i2s, because my dac tda1541 is able to input i2s, not left justified format. Once the signal is received by the dac box, it is converted to i2s and re-synched by the same master clock. Jitter at the dac pins is essentially the jitter on the output of the clock--in my case a Tent clock which is spec'd at under 3ps. The frequency is 11.2896 for both dac and transport, everything is synchronous. It sounds wonderful and transformed my dac. As you can see, this circuit is pretty specialized. For more details I created a simple website mainly for squeezebox users (below). I'm not familiar with the tda1545 chip and its permutations.

http://home.socal.rr.com/audio_gestalt/default.htm