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RE: Is there really any advantage in balanced digital lines over unbalanced?

In a digital audio interface, there could be an advantage via a balanced interface due to jitter. A balanced digital interface can have the same benefit as any other balanced signal interface, that being the rejection of common-mode noise. Such noise could degrade the jitter performance of the DAC input reciever.

There would be further advantage in the AES differential balanced interface if the signal amplitude was much smaller, as it is in LVDS digital interface technology. Differential circuits inherently have twice the slew rate (which is better for minimizing interface jitter) than an single ended implementation of the same circuit. That potential benefit is erased if the signal voltage itself is more than double what it needs to be.
_
Ken Newton


Edits: 06/01/12
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