The AUSampler software instrument (included with Garage Band) has a built-in A-440 tone. I'm not at a computer that I can test it on right but if you select that and nothing else (no other sample ...
How to measure linearity of an ADC using sine-wave input. How do non-idealities of a sine wave affect ADC linearity while testing it. Testing an ADC’s linearity. To obtain the transfer function of an ...