SPDIF and OPTICAL (Toslink) Pinout/Schematic

[JayShoe]

Hello,

Can someone please verify the schematic below looks like all we need to successfully implement an Optical / TOSLINK IO with T4.1 (other than software)?


Using FCR6842032R and FCR6842032T made by CLIFF Electronic Components Ltd.

Frank Boesing has linked to some TOSLINK / SPDIF circuits on his github page. I will quote him below to contribute to the discussion/documentation here.

Optical output ("TOSLINK") http://www.hardwarebook.info/S/PDIF_optical

Pauls Teensy TOSLINK: https://www.oshpark.com/shared_projects/KcDBKHta

S/PDIF output buffer circuits: http://www.hardwarebook.info/S/PDIF_output

http://www.epanorama.net/documents/audio/spdif.html

https://forum.pjrc.com/threads/28639-S-pdif

AC3-Output: https://forum.pjrc.com/threads/29454...ll=1#post80337

I'm also going to link to the design tool below.

https://www.pjrc.com/teensy/gui/?info=AudioInputSPDIF3
https://www.pjrc.com/teensy/gui/?inf...dioInputSPDIF3 <- pin 15
https://www.pjrc.com/teensy/gui/?info=AudioOutputSPDIF
https://www.pjrc.com/teensy/gui/?info=AudioOutputSPDIF2
https://www.pjrc.com/teensy/gui/?info=AudioOutputSPDIF3 <- pin 14

If done correctly, it seems that optical is easier to implement than SPDIF. I think optical might be cheaper because of the transformer and/or buffer drivers. I imagine optical is almost as ubiquitous as SPDIF? An external converter is pretty easy to come by if not, I think.

Can someone please verify my optical jack schematic? Also, will this work with ADAT?

Jay

[MatrixRat]

Hmm, Murphy's law and datasheets.
For the receiver I'd suggest that Vcc (pin 3)is the device's +V supply pin and pin 1 is Data OUT.
For the transmitter I'd suggest that Vcc (pin 3)is the device's +V supply pin and pin 1 is Data IN. Also suggest 100R between T4's SPDIF TX and DATA IN, as close as possible to T4 to absorb overshoot/ground bounce.

[JayShoe]

Hmm, Murphy's law and datasheets.

Yes you are correct. I had been drawing various circuits with different parts and wound up here. It's strange that the two products in the same series are so different. I think the following is right.

FCR6842032T (1=GND, 2=VCC, 3=VIN)
FCR6842032R (1=VOUT, 2=GND, 3=VCC)
VCC = 5V

Also suggest 100R between T4's SPDIF TX and DATA IN, as close as possible to T4 to absorb overshoot/ground bounce.

Thanks for the tip! Here is a 100R resistor in series next to the Teensy.