Hi, I’m interested in using the QA403 to characterize distortion in some electronics circuits that aren’t technically audio but operate at or near typical audio frequencies. Is there any documentation about what if any antialiasing filters may be present on the ADC input path, and how they might affect the signal or frequency response at higher frequencies (say, 10 kHz or more?)
Thanks!
On the product page for the QA403, you’ll find the product sheet linked below.
On page 24, you’ll see the results of a test where a 0 dBV 346 kHz tone was injected to the QA403. That 346 tone at a 48k sample rate should fold back (alias) at 10 kHz. And in the plot you can see the response at 10 kHz is below -120 dB.
In short, if it’s an out of band signal, it will be tough to measure.
Don’t know how i missed that - thanks so much 