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Old 26th December 2003, 03:47 PM   #1
splus is offline splus  Taiwan
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Join Date: Dec 2003
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Default CDROM SPDIF question

Hi,
I found my CDROM's SPDIF output is TTL level but come with +5V DC bias.
I directly plug it into CS8414 but it does not work.
how do I remove the 5V DC bias? Thanks!


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Old 28th December 2003, 08:15 AM   #2
pieris is offline pieris  United States
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You can remove bias with a capacitor (perhaps 0.1uF) in series with the SPDIF output. Usually a transformer is used on the receiving end (in front of the CS8414) which effectively eliminates the DC bias.

See Appendix A of the CS8414 datasheet:
http://www.cirrus.com/en/pubs/proDatasheet/8413-4.pdf
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