Oh, my cable length will be less than six inches. I intend to house the input selector and DAC in the same housing. Or I may use the input selector to add a multi-way option to the digital input of a MiniDSP 2x8, again within the same chassis.
So 24/192 is a stretch, which means some of these higher rates I read about like 32/384 are impossible. Might be perfectly adequate for me but may work for some here. Thanks a lot. I might just build one and try.
Do you think I'll need to work with 6dB gain even if my cable length is 3-6"?
At 6" cable length I think you can just use the unity gain setup, and either a 75-R near end termination only, leaving the far end unterminated, or directly drive the cable with 75-R termination at far end. The cable can be a pair of tightly twisted wires. Impedance matching isn't that critical, as 6" is the cable length where transmission line effects start coming into play for signals having tr/tf in the neighborhood of 1 nS.
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