SPDIF Out
in [Hardware]
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From: Grinder on 15 May 2010 17:37 Lightning zapped an Asus A7N266-VM based PC, and I've elected to re-gut it with Gigabyte G41M-ES2L. The Asus board game with an SPDIF output that was fastened into a PCI slot on the case, and plugged into a header on the board: +---+ | 1 | +5V +---+ | x | +---+ | 3 | SPDIFOUT +---+ | 4 | GND +---+ The new board, the G41M-ES2L, has a SPDIF I/O header: +---+---+ Power | 1 | x | +---+---+ SPDIF | 3 | 4 | SPDIFI +---+---+ GND | 5 | 6 | GND +---+---+ The ports are mounted on a small circuit board with a few components. I should be able to reuse this bit by reconfiguring my connector, right? +5V <=> Power SPDIFOUT <=> SPDIF GND <=> GND (pin 5)
From: Paul on 15 May 2010 20:27 Grinder wrote: > Lightning zapped an Asus A7N266-VM based PC, and I've elected to re-gut > it with Gigabyte G41M-ES2L. The Asus board game with an SPDIF output > that was fastened into a PCI slot on the case, and plugged into a header > on the board: > > +---+ > | 1 | +5V > +---+ > | x | > +---+ > | 3 | SPDIFOUT > +---+ > | 4 | GND > +---+ > > The new board, the G41M-ES2L, has a SPDIF I/O header: > > +---+---+ > Power | 1 | x | > +---+---+ > SPDIF | 3 | 4 | SPDIFI > +---+---+ > GND | 5 | 6 | GND > +---+---+ > > The ports are mounted on a small circuit board with a few components. I > should be able to reuse this bit by reconfiguring my connector, right? > > +5V <=> Power > SPDIFOUT <=> SPDIF > GND <=> GND (pin 5) That sounds like it should work. The SPDIF signal is probably an SPDIF_OUT, as the other one has been identified as an input. The reason for having power available on the connector, is for adapter boards that has TOSLINK modules on them. The transmit and receive optics modules would need a source of power, to convert to TOSLINK light format. In terms of signal standards, there are two different standards. An SPDIF signal intended to drive copper right away, is a relatively low amplitude. Some audiophile equipment, would have a true SPDIF signal on any connector located on the equipment. Your 2x3 header, on the other hand, has logic level signals on it. So you can't just connect your stereo receiver directly to those pins. The adapter should be used with it. On my Asus adapter module, there are two outputs driven by SPDIF_OUT. The RCA connector for connecting a coax cable, consists of a voltage divider (designed to match the coax impedance), plus a coupling capacitor. That shrinks the signal to the right amplitude for the coax. The SPDIF_OUT logic signal, is also sent to a TOSLINK transmitter. The logic signal would be used inside the transmitter, to turn the LED in there on and off. The module needs +5V in that case, to power the TOSLINK module. I don't expect you'll have a problem, but thought I should throw in those comments so you have some idea what is on the adapter. On my Asus adapter module, the cable is removable. I took a look at it, and pin 2 is "blocked" by something jammed in the hole. You may have a bit of a challenge moving the one pin and wire over, to convert it to a 1x3 pinout. Paul
From: Grinder on 16 May 2010 15:44 On 5/15/2010 7:27 PM, Paul wrote: > Grinder wrote: >> Lightning zapped an Asus A7N266-VM based PC, and I've elected to >> re-gut it with Gigabyte G41M-ES2L. The Asus board game with an SPDIF >> output that was fastened into a PCI slot on the case, and plugged into >> a header on the board: >> >> +---+ >> | 1 | +5V >> +---+ >> | x | >> +---+ >> | 3 | SPDIFOUT >> +---+ >> | 4 | GND >> +---+ >> >> The new board, the G41M-ES2L, has a SPDIF I/O header: >> >> +---+---+ >> Power | 1 | x | >> +---+---+ >> SPDIF | 3 | 4 | SPDIFI >> +---+---+ >> GND | 5 | 6 | GND >> +---+---+ >> >> The ports are mounted on a small circuit board with a few components. >> I should be able to reuse this bit by reconfiguring my connector, right? >> >> +5V <=> Power >> SPDIFOUT <=> SPDIF >> GND <=> GND (pin 5) > > That sounds like it should work. The SPDIF signal is probably > an SPDIF_OUT, as the other one has been identified as an > input. > > The reason for having power available on the connector, is > for adapter boards that has TOSLINK modules on them. The transmit > and receive optics modules would need a source of power, to convert to > TOSLINK light format. > > In terms of signal standards, there are two different standards. > > An SPDIF signal intended to drive copper right away, is a relatively > low amplitude. Some audiophile equipment, would have a true SPDIF > signal on any connector located on the equipment. > > Your 2x3 header, on the other hand, has logic level signals on it. > So you can't just connect your stereo receiver directly to those > pins. The adapter should be used with it. > > On my Asus adapter module, there are two outputs driven by SPDIF_OUT. > The RCA connector for connecting a coax cable, consists of a voltage > divider > (designed to match the coax impedance), plus a coupling capacitor. That > shrinks the signal to the right amplitude for the coax. The SPDIF_OUT > logic signal, is also sent to a TOSLINK transmitter. The logic signal > would be used inside the transmitter, to turn the LED in there on and > off. The module needs +5V in that case, to power the TOSLINK module. > > I don't expect you'll have a problem, but thought I should throw in > those comments so you have some idea what is on the adapter. > > On my Asus adapter module, the cable is removable. I took a look at > it, and pin 2 is "blocked" by something jammed in the hole. You may have > a bit of a challenge moving the one pin and wire over, to convert > it to a 1x3 pinout. Yeah, I looked through my junk pile hoping to find a 2x3 header block so that I could use that block to make a polarized plug, but it looks like all I have is 1x2 and the 1x4 that came with the adapter. Moving it over was no biggie, so I shaved one of the sockets off to make a 1x3. The intended user probably won't even hook speakers up to the analog out on this board, much less SPDIF. Thanks for the notes of interest.
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