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Stacking/Piggybacking Opamps and DACs in parallel

post #1 of 23
9/24/09 at 6:35pm
Thread Starter 
Anyone have any experience in this? I've seen reference to it a couple of times here on the forum, but no definite answer on what it does- AFAIK it should improve performance- when I was into RC, stacking MOSFETS was "the thing"- stacks 6 or 7 high were desirable. I have a couple opamps I could probably spare, but would anyone with a larger collection of expendable ICs like to try it and report back? Or anyone with a science degree care to explain why it's a stupid idea ? Thanks.
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post #2 of 23
9/24/09 at 6:38pm
Have you searched ? http://www.head-fi.org/forums/f6/op-...arallel-47584/
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post #3 of 23
9/24/09 at 6:50pm
I've heard of opamps, but I think it would be a really bad idea to stack DACs. Someone correct me if I'm wrong.
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post #4 of 23
9/24/09 at 6:53pm
Thread Starter 
^My interest in this topic started when I saw the "Turbo Mod" for some vintage CDP which involved stacking DACs.
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post #5 of 23
9/24/09 at 7:09pm
Most DACs can definitely be ran in parallel, as can buffers, opamps cannot.
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post #6 of 23
9/24/09 at 7:17pm
um, that would be some (very few actually) ICs can be simply paralleled - but not many without additional components to operate safely

Voltage output DACs require load sharing resistors - many have ref pins that may not like being wired together
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post #7 of 23
9/24/09 at 7:17pm
AudiogoN Reviews: VALAB 8x TDA1543 NOS DAC DA converter



"8x Paralled TDA1543 /w no filter"...but I'm quite sure that a single AK4396(128X OS) will blow them away
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post #8 of 23
9/24/09 at 9:02pm
I have seen it done for certain designs.
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post #9 of 23
9/24/09 at 9:05pm
Thread Starter 
Well then, I'd like to take this opportunity to shift the thread towards DAC stacking. Anyone have any experience in it?

By the way, leeperry, I'm talking about mounting one DAC right on top of the other and soldering the legs together.
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post #10 of 23
9/24/09 at 9:11pm
IIRC, I seen it done with a certain DAC chip but I cannot remember which one. I am going from memory of a really strange design I had seen a long time ago.
I cannot remember which chip it was, it was just a DIY type project but it was a common thing to do with this chip I guess. Maybe I will see if I can find the information for you.
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post #11 of 23
9/24/09 at 9:13pm
I've just bought the DDDac.

Have a look at dddac.de. The guy there goes into some detail about stacking the TDA1543 chips to improve bit depth. 8 or 12 seems to be where the sensible limit is.

I've had single TDA1543 DAC before, so this will be interesting.

Fran
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post #12 of 23
9/24/09 at 9:16pm
Thread Starter 
Looking forward to it fran. Please keep us updated!
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post #13 of 23
9/24/09 at 9:41pm
I was going to mention the DDDac.
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post #14 of 23
9/25/09 at 2:05pm
Quote:
Originally Posted by fran View Post
I've just bought the DDDac.

Have a look at dddac.de. The guy there goes into some detail about stacking the TDA1543 chips to improve bit depth. 8 or 12 seems to be where the sensible limit is.

I've had single TDA1543 DAC before, so this will be interesting.

Fran
It doesn't affect the bit depth, all it does is give you a higher output current so you can use passive I/V without a buffer... No affect in the digital domain.
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post #15 of 23
9/25/09 at 5:39pm
Well it should lower the noise floor as well and lower distortion...but if it's audible or not?
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