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s/pdif on motherboard but no socket
s/pdif on motherboard but no socket
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Old 13th September 2017, 02:18 PM   #11
mrWagner is offline mrWagner  Hungary
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Quote:
Originally Posted by thyristor44 View Post
Yes I have a scope, I expect 5v signal on ttl but what would be the output if not ttl.
This pc is brand new to me so it will be some time before I contemplate removing the motherboard. I have bricked a few things in my past.
Expect 3.3V, maybe it is not TTL level, just better to describe it.
If not 0 to 3.3V, then around -0.5V to +0.5V
If you have any cable that you can connect on it, then you will not brick it.
I had some old PC speakers, cut the cable off and used if for measuring.
I only bricked a HDD before
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Old 13th September 2017, 07:30 PM   #12
JeffYoung is offline JeffYoung  Ireland
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s/pdif on motherboard but no socket
Actually I think a S/PDIF signal should be around +/- 0.25V (the 0.5V is peak-to-peak).

A great resource on all things S/PDIF: epanorama.net/S/PDIF Interface.
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Old 13th September 2017, 08:31 PM   #13
JeffYoung is offline JeffYoung  Ireland
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s/pdif on motherboard but no socket
So it's 0 to +0.5V?
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Old 13th September 2017, 08:40 PM   #14
wwenze is offline wwenze  Singapore
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I deleted my previous post because I realized absolute voltage doesn't matter with a transformer.

An SPDIF receiver chip like CS8416 takes in a differential input voltage

But digital circuits don't output negative voltages.

Last edited by wwenze; 13th September 2017 at 08:59 PM.
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Old 13th September 2017, 10:08 PM   #15
JeffYoung is offline JeffYoung  Ireland
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s/pdif on motherboard but no socket
Ah... right, which is why the spec only states the peak-to-peak voltage.

(And given that, it would certainly be easier for the motherboard to output 0 to +0.5V.)
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Old 14th September 2017, 11:20 AM   #16
thyristor44 is offline thyristor44
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Quote:
Originally Posted by JeffYoung View Post
Actually I think a S/PDIF signal should be around +/- 0.25V (the 0.5V is peak-to-peak).

A great resource on all things S/PDIF: epanorama.net/S/PDIF Interface.
Thats a very useful site, thanks.
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Old 14th September 2017, 03:31 PM   #17
mrWagner is offline mrWagner  Hungary
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Many times chips also handle AES signal level and that can go as high as 10Vpp.
So usually they can handle spdif with with bit higher voltages.
The link above also says spdif goes 0,5..1V.
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