Non OS TDA1543 PCB Layout - Page 10 - diyAudio
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Old 4th December 2005, 06:28 PM   #91
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Quote:
What chip does your other dac use?
Yes, it's a 1704-based circuit. In fact, it is very similar to this one. Same output filter topology - 3rd order linear phase low slope Bessel. Same input circuit. Same type of layout. Easy to compare apples to apples, as both DACs are exact same size, have same pinout. Since they are plug compatible, I was able to do an easy A/B comparison.

Quote:
Did you connect the tda1543 dac output to a scope?
Yes, and thanks for bringing me back onto topic. I scoped out everything, not just the outputs. I checked and optimized every signal on every pin of every chip.

And that is sort of the orignal topic, how to do a layout where digital signals do not screw up the analog ones and vice versa. How to wire up the PLL filter components on the receiver for minimum jitter. And basically, it's all about respecting the signal currents and returning them via proper paths. Much of the quality of a DAC is the layout itself.

Maybe I'll post some scope photos. The clock and data signals are near prefect. Very clean, low noise, good edges, no over or undershoot. You'll see how the RLC filters on the digital lines help. Those 3.3uH inductors on the schematic are not just guesses, but calculated and then optimized by looking at the scope. Sure, it takes more components, but the benefits are real.

Quote:
How does it sound?
Perhaps I just did not implement the NONOS properly. Thinking my quest for lowest noise and highest linearity was a mistake. You'll see I used 25 ohms for I-V conversion. I purposely kept the compliance to a minimum (specification is 25mV, I pushed it to 50mV) in order to reduce distortion. Most 1543 DIY DACs use 270 ohms or so for this resistor (higher gain). Perhaps the higher output impedance and distortion are part of the magic? It is something I did not try.

jh
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Old 4th December 2005, 08:18 PM   #92
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Hi hagtech,

Interesting circuit you got there. I also played a bit with TDA1543 in NOS implementation and attached is the circuit I'm presently using. I didn't design it with an eye on a meter, but rather based on listening tests and have to admit that I can detect some magic. Comparing to my other DAC (ML390S), the NOS TDA1543 sounds much more alive, with similar resolution, better low end, better PRAT, but what's most important, it actually sounds like music and not like artificial reproduction. I can't remember when was the last time I actually listened to the other DAC
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Old 4th December 2005, 08:23 PM   #93
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And here's the actual layout. TDA1543 is mounted in a bottom layer.
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Old 4th December 2005, 11:18 PM   #94
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The bottom layer:
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Old 8th December 2005, 01:39 AM   #95
Alfi is offline Alfi  United States
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Hi Peter,
Thanks for sharing the schematic. What are the voltage/current values of the power transformer secondaries for your circuit? Is there a specific make/model of power transformer you prefer?

Are you currently still using the same parts you spec'ed in the schematic(ie blackgate, riken, oscon...) ?

thanks
Al
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