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Old 14th November 2003, 05:38 PM   #1
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Default I must be crazy to build my DAC this way

I finally decided to build TDA1541S2 based DAC. As usually I'm looking for best ways to implement the mechanical aspects of the design, so this is what I think could be a proper method to dress up S2 chip
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Old 14th November 2003, 05:41 PM   #2
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Initially I was considering PCB, but somehow didn't like the restrictions dictated by 2 dimentional plane. So last evening I took a piece of brass and played with it a bit. I mounted the chip on top of 1/2 square rod and attached to it on top a piece of PCB forming ground plane. The rest is pretty self explanatory. I wonder myself if this is a good move or not?

Any comments on 560p Wima? I didn't know if this a good choice, but that's what seemed to fit there.
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Old 14th November 2003, 05:43 PM   #3
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Worth noting is the way I attached SMD cap bypasses (X5U 0.1u and X7R 0.01u). This is technically the shortest path possible. Look under 2 BG caps on the right.
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Old 14th November 2003, 06:08 PM   #4
Pedja is offline Pedja  Serbia
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Hi Peter,

Yes, it is OK I'd say (excellent actually), but try to divide digital and analog grounds before you joint them. Decoupling caps (pins 26 and 28) belong to the digital, those 14 caps to the analog part.

Pedja
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Old 14th November 2003, 06:11 PM   #5
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Also, though it doesn't hurt, that jumper between pins 2 and 4 shouldn't be necessary.

Pedja
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Old 14th November 2003, 06:11 PM   #6
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I was thinking about splitting grounds, but checked the PCB board on my Marantz CD 94 and both grounds were connected at the chip (same ground plane). Doing it this way definitely simplifies things, but I'm not sure how this affects sound. If they are separated at the chip, were should they meet then?
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Old 14th November 2003, 06:14 PM   #7
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Quote:
Originally posted by Pedja
Hi Peter,

Yes, it is OK I'd say (excellent actually), but try to divide digital and analog grounds before you joint them. Decoupling caps (pins 26 and 28) belong to the digital, those 14 caps to the analog part.

Pedja
So 5v supplies are digital and -15 is analog? I could use a center ground strip to route grounds from pins 26 and 28 to the common point on the other side.
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Old 14th November 2003, 06:19 PM   #8
Pedja is offline Pedja  Serbia
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Quote:
Originally posted by Peter Daniel
If they are separated at the chip, were should they meet then?
Somewhere below/above the chip. Just make sure that the analog and digital ground paths are not messed, i.e. provide that the digital part doesn't polute an analog part.

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So 5v supplies are digital and -15 is analog?
Yes.

Pedja
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Old 14th November 2003, 06:23 PM   #9
Pedja is offline Pedja  Serbia
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Quote:
Originally posted by Peter Daniel
So 5v supplies are digital and -15 is analog? I could use a center ground strip to route grounds from pins 26 and 28 to the common point on the other side.
Yes, it seems like you have three nice ground buses.
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Old 14th November 2003, 07:54 PM   #10
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Pedja,

I just checked your site and the info is good as usually (on TDA1541 Dac)
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