S/PDIF out: why use a transformer?

Thoru · 13th March 2004, 07:50 PM

Hi,

I've a chip that outputs s/pdif data. I only need to convert it to the correct voltage and output impedance. Looking at how others do that I see two options: Some with only resistors and others with a transformer for changing the voltage and some resistors for the correct output impendance.
Why do they use the transformers? For CM-current reduction? I learned that it's better not to use transformers for that purpose...

Thanks in advance,

Remco Poelstra

MWP · 14th March 2004, 03:59 AM

Transformers are probably used to give ground isolation.

Thoru · 14th March 2004, 10:21 AM

Thanks for your reply.

If they use it for ground isolation, then I suppose that I shouldn't connect the ground/shield of the wire to the case of the application, right?

Remco Poelstra

13th March 2004, 07:50 PM	#1
Thoru diyAudio Member Join Date: Jan 2004 Location: Eindhoven	S/PDIF out: why use a transformer? Hi, I've a chip that outputs s/pdif data. I only need to convert it to the correct voltage and output impedance. Looking at how others do that I see two options: Some with only resistors and others with a transformer for changing the voltage and some resistors for the correct output impendance. Why do they use the transformers? For CM-current reduction? I learned that it's better not to use transformers for that purpose... Thanks in advance, Remco Poelstra

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14th March 2004, 03:59 AM	#2
MWP diyAudio Member Join Date: Oct 2002 Location: Adelaide, South Australia	Transformers are probably used to give ground isolation.

14th March 2004, 10:21 AM	#3
Thoru diyAudio Member Join Date: Jan 2004 Location: Eindhoven	Thanks for your reply. If they use it for ground isolation, then I suppose that I shouldn't connect the ground/shield of the wire to the case of the application, right? Remco Poelstra