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Old 18th June 2008, 12:27 AM   #11
rossl is offline rossl  United States
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It probably doesn't matter. Your CS8420 can receive a differential input voltage of 200 mV minimum and maximum of VCC, 5 volts.

The coupling cap won't hurt. You may not need it. You can try it with and without. 0.22 uF will work fine.
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Old 18th June 2008, 02:34 AM   #12
Tenson is offline Tenson  United Kingdom
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Hi,

Thanks for your replies.

You are of course right that the DAC can handle qite a wide range, but if the output was only 1V to start with I don't want to put it through a voltage divider.

However, I looked at the datasheet for the Toshiba TX176 optical transmitter and it has a lower limit of 2v for its input, so the signal must be 5v or 3v. Adding the voltage divider posted above should bring that in to a safe level for the majority of DACs.
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Old 18th June 2008, 10:14 PM   #13
Tenson is offline Tenson  United Kingdom
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Thanks guys, all sorted

I wrote up what I did so the other Cyrus owners can do the same if they want.

http://www.rdhworld.co.uk/punbb/viewtopic.php?id=9948
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Old 18th June 2008, 10:53 PM   #14
rossl is offline rossl  United States
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good job !

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