Q: A7N266-VM and SPDIF

  • Thread starter Thread starter Sanjay Chakravarty
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Sanjay Chakravarty

I bought this A7N266-VM mobo (I know its a dinosaur, but my kid is happy
playing games on it), and notice that it supports SPDIF on a 2-pin
connector. From what I understand, this needs to be converted to coaxial in
order to drive my AV Receiver system, right? Does anyone know the circuit to
do that?

Regards
Sanjay
 
Sanjay Chakravarty said:
I bought this A7N266-VM mobo (I know its a dinosaur, but my kid is happy
playing games on it), and notice that it supports SPDIF on a 2-pin
connector. From what I understand, this needs to be converted to coaxial in
order to drive my AV Receiver system, right? Does anyone know the circuit to
do that?

Regards
Sanjay
Click to expand...

It's on an optional riser board.. an Asus dealer should be able to supply
the necessary part...

HTH

Dave
 
"Dave Catchpole" said:
It's on an optional riser board.. an Asus dealer should be able to supply
the necessary part...

HTH

Dave
Click to expand...

Comparing the picture in the manual to this web page:

http://www.asus.com.tw/mb/mb_accessories.htm

it looks like the left most "SPDIF Out" module.

This page at Newegg has a couple of pictures on the "See it" link - they
are slightly different but presumably functionally identical.

http://www.newegg.com/app/viewproduct.asp?DEPA=&submit=Go&description=N82E16813131204

I don't think you can use the SPDIF signal directly from the motherboard,
because the signal has enough amplitude to drive the optical module.
There are several surface mount components near the coax jack of the
adapter, and their job is to "tame" the signal to a level suitable for
your receiver. According to one web page, around 0.5V peak to peak is
driven down the cable.

Cable: 75ohm +/-5% (l<10m) or 75ohm +/-35% (l>10m)
* Line driver:
* Zout: 75ohm +/-20% (100kHz .. 6Mhz)
* Vout: 0.4Vpp .. 0.6Vpp, <0.05Vdc (75ohm terminated)
* Line receiver:
* Zin: 75ohm +/-5%
* Vin: 0.2Vpp .. 0.6Vpp

HTH,
Paul
 
Paul said:
Comparing the picture in the manual to this web page:

http://www.asus.com.tw/mb/mb_accessories.htm

it looks like the left most "SPDIF Out" module.

This page at Newegg has a couple of pictures on the "See it" link -
they
are slightly different but presumably functionally identical.
Click to expand...
http://www.newegg.com/app/viewproduct.asp?DEPA=&submit=Go&description=N82E16813131204

Anyone know where to get these in the UK?

Ebuyer do a 'J' panel with spdif for Asus, and I guess I could mod
that to fit the spdif part into a PCI blanking plate for rear
mounting, but I'd prefer the correct item if possible.

Any help appreciated.

TIA

Gary.
 
Thanks, Paul. I guess from the line driver specs you gave that finding a
chip which does digital-in, coax-out with the right termination impedance
might be all that's reqd.

Regards
Sanjay
 
"Sanjay Chakravarty" said:
Thanks, Paul. I guess from the line driver specs you gave that finding a
chip which does digital-in, coax-out with the right termination impedance
might be all that's reqd.

Regards
Sanjay
Click to expand...

I just made the comment, in case anyone was tempted to take some wire
and connect directly to the motherboard. Presumably, the Asus adapter
plate contains an attenuator that matches a 75 ohm transmission
line, when using the RCA connector. So, the Asus adapter does have
a necessary function.

Paul
 
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