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You know, Sunil, the only thing is that I am not convinced about is the importance of transport -- the reason being buffering on the DAC makes transport influence moot in my opinion.
If you have a buffer there is a very hypothetical case that the clock of both sender and receiver are exactly in sync. In practice they differ.In case of USB there is always a buffer but the method to manage the buffer differs.In case of adaptive synchronization, the DAC varies the speed of the clock driving the DA to avoid over/under run.In case of asynchronous synchronization, the DAC runs at a fixed speed and regulates the amount of data send by the PC. This implementation is low on input jitter.Given your budget, I should look for a async USB implementation.Obvious a DAC is more than a USB protocol.