1
\$\begingroup\$

I'd like to work with this chip : http://www.cirrus.com/cn/pubs/proDatasheet/WM8804_v4.5.pdf

The S/PDIF Input mentioned in the datasheet states that the input impedance is 75Ohm. So I think that it should be used with 75Ohm coaxial cable, with RCA jacks.

So, my question is simple (and probably stupid too) : does any RCA connector work for S/PDIF interface ?

\$\endgroup\$
2
  • 1
    \$\begingroup\$ Yes it does, many audio devices have a COAX SPDIF input or output. If you connect these with a (75 ohm) COAX cable that usually just works. SPDIF does not use such a high frequency (a few MHz I think) so it is not so critical with regard to the connector. \$\endgroup\$
    – Bimpelrekkie
    Commented May 12, 2016 at 14:54
  • \$\begingroup\$ @FakeMoustache - it is subject to gross transmission line effects, but indeed not to connectors in the way microwave RF would be. Years ago I ran into an S/PDIF receiver implementation that I could reliably make fail or work by removing or replacing the terminating resistor in the receive circuit, though if I recall a later improvement to the DSP vendor's closely held firmware made their clock recovery more robust against waveform distortions. \$\endgroup\$
    – Chris Stratton
    Commented May 12, 2016 at 15:10

1 Answer 1

Reset to default
0
\$\begingroup\$

Yes, it will work with ANY RCA ("Cinch" in EU) connector. RCA connectors have a fixed mechanical dimension and it is not possible to make them 75-ohm (or 50 ohm or whatever). However using 75 ohm cable is desirable if you are using lengths ~>1m

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.