whos knows the most about the TDA1541 ???

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Hello,
I hope there is a spezialist for the good old TDA1541...
I want to use the Pin 4 (System-Clock-Input) for my DAC-DIY, I also tuned well some Marantz or Philips Players...
my Question:
In the datasheet the TDA1541 (without A) has the oppinion to use the Pin 4 as a System-Clock-Input.
The TDA1541A doesn´t mention this in the datasheet...
I have tested it with a TDA1541A S1 Silver-Crown, and think it works...
Can somebody tell me the differences in the TDA1541, A, A R1, A S1 ???
Does the System-Clock-Input work at the A as well. Or did they really change the inner things on the way from ( ) to (A) ?
Please tell me if you know the details...
Thank you,
best regards,
Manfred.
 
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