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TDA1543- How many to use?
TDA1543- How many to use?
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Old 11th February 2003, 09:56 AM   #1
Dr.H is offline Dr.H
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Join Date: Apr 2002
Default TDA1543- How many to use?


I have 16 TDA1543's available for use. What is teh optimal number for teh zero-oversampling DAC everyone raves about?

Should I use all 16 and get better signal/noise ratio?

Would one CS8412 still suffice for all 16?

Would I need to reclock for each TDA1543 (i.e. 16x 74hc74) or can I simply place one 74hc74 between the CS8412 and the 16 TDA1543?

Is the TDA1543 best run at 5V or 8V?

Thanks for helpful hints!
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Old 25th February 2003, 03:27 PM   #2
Elso Kwak is offline Elso Kwak  Philippines
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
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Lightbulb TDA1543

Hi Ryan,
In my experience one is the optimal number for the TDA1543.
The high's get kind of smeared when pallelling TDA1543's. Also I like +5V supply the most. I posted a schematic that I liked best.
If you are asynchronously reclocking it is best to use two flip-flops in series to countermeasure the metastability effect. See Feddes site for the idea. Click on the schematic of the DAC. Best use 74VHC74 (two flip-flops in one package. )
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Old 25th February 2003, 10:36 PM   #3
rfbrw is offline rfbrw
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As another option you could use one stereo pair per channel in a balanced configuration i.e. one device per channel.

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Old 6th March 2003, 12:46 PM   #4
Zelko is offline Zelko  Croatia
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Join Date: Mar 2003
Location: Zagreb
I prefer 3 paralleled, the best distorsion spectrum, dominant second, a bit of third and that's all.
The same has been confirmed on listening tests.
One only is a bit crude, rough in highs and a lot of 3rd harmonic.
Try different biasing and load resistors.
Good luck,
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