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Old 28th November 2006, 02:05 PM   #1
ary is offline ary  China
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Default See my pure "USB 2 SPDIF"

Since almost everybody here got a PC, since almost everybody here got a DAC.
May everybody here, like me, want a "USB to SPDIF" .

Here, I've present a pure "USB 2 SPDIF" by using the universal PCM2902 ( http://focus.ti.com/lit/ds/symlink/pcm2902.pdf )
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Old 28th November 2006, 02:10 PM   #2
ary is offline ary  China
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Default The PCB

HoHo

It's only inclued the basic elements

See
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Old 28th November 2006, 02:32 PM   #3
ary is offline ary  China
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Default The bottom_layer of the layout

Just print it at 1:1 in A4 paper
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Old 29th November 2006, 01:08 AM   #4
MWP is offline MWP  Australia
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[me = idiot]
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Old 29th November 2006, 01:26 AM   #5
Leolabs is offline Leolabs  Malaysia
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Piao Liang!
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Old 29th November 2006, 02:38 AM   #6
ary is offline ary  China
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Hi Leolabs,

Yes, it's a real cute.

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Old 29th November 2006, 01:03 PM   #7
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Great PCB, thanks for your share
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Old 30th November 2006, 04:02 AM   #8
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You have no decoupling or filtering on the incoming 5Vdc whatsoever?

jh
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Old 30th November 2006, 06:38 AM   #9
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Quote:
Originally posted by hagtech
You have no decoupling or filtering on the incoming 5Vdc whatsoever?

jh

Yes hagtech,

maybe adding a filter will be work. but wheather this would be needed is discussing ,and by this simple curcuit, it really perform well.

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Old 30th November 2006, 07:01 AM   #10
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Sure, it works. But don't you want it to work its best? Have you no desire to bring out the best performance possible? Just because it makes sound doesn't mean you stop there and be satisfied.

Look, you have LDO regulators onboard this chip, and to stabilize them you need some low impedance decoupling at their emitters (or sources). Otherwise the regulators can go wild. Sure, it might still work, but it is not good design to depend on decoupling at the other end of a USB cable. You are also allowing all of the RF noise from PC to enter the audio system.

Suggest you add an LC or a bead-C to filter this incoming 5V line.

jh
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