Rank: Advanced Member
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Joined: 10/18/2010(UTC)
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Location: UK
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I have the 8804 module and the Toslink module.
AFAIK the 8804 is configured by default to use a comparator input on RX0 (500mVppAC) and the Toslink module outputs 3.3V logic.
Any suggestions on how to interface these two?
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Rank: Advanced Member
Groups: Member
Joined: 10/18/2010(UTC)
Posts: 36
Location: UK
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So many views and still no answer.
The answer is to use a simple voltage divider. Remember the toslink module can only source/sink 2mA, so make the divider resistance is suitably high enough.
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You can simply connect the toslink output directly to the wm8804.
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Rank: Advanced Member
Groups: Member
Joined: 10/18/2010(UTC)
Posts: 36
Location: UK
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OK. I was concerned that the 3.3V output from the toslink module could cause problems when the 8804 is configured for 500mV. Also the 8804 board has a 75 ohm input impedance, 3.3V into this results in 44mA which is considerably more than the 2mA source / sink specified for the toslink module.
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