I am fumbling a bit with a Lundahl pulse transformer providing the input signal to a CS8412....but what wuould be the ideal level of the signal for this Chip....just follow the spec or are there other experiences?
Before the transformer I put a capacitor to keep DC out and loading the line will drastically reduce the signal while its shape remains the same (similar minor overshoot/ringing)...does it still make sense to load the line with 75 Ohm since the signal looks already ok without the load?
Before the transformer I put a capacitor to keep DC out and loading the line will drastically reduce the signal while its shape remains the same (similar minor overshoot/ringing)...does it still make sense to load the line with 75 Ohm since the signal looks already ok without the load?
A 75 ohm line needs a 75 ohm termination if you want it to work properly. Assuming a 75 ohm source, this will halve the received voltage. This 'drastic' reduction in signal level is a feature, not a problem.
Drastic can still be a feature ....still the question remains what the ideal signal voltage would be for the CS input...
The CS8412 datasheet (top of page 3) says 400mV pk-pk minimum (for consumer input wiring i.e. SPDIF).
Yep, that must be it!
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