I see that this ADC has a built in voltage reference, therefore I wont have to bias my audio signal as it goes into the ADC input. The thing that confuses me is however the full-scale input voltage listed in the datasheet:

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So say my supply voltage (VA) is 3.3V, does this mean that the maximum unclipped input amplitude is equal to (3.3*0.56/2) = 0.924V? This just seems low to me.


This is an audio digitizer. Since the standard Line In voltage is about 1 volt p/p, there is no obvious reason to require a greater input range.

And on what basis do you judge your calculated range to be low? Why, exactly, does it "just seems low to me"?

  • \$\begingroup\$ When I have used ADCs in the past, the max input voltage swing was a lot closer to the positive rail. This one is only 0.56*Vdd. \$\endgroup\$ – BBales Dec 4 '15 at 17:52

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