R/E/P > j.hall

converter calibration

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endarn:
I think that happens very difficult.

Jim Williams:
Lower your analog levels and the noise floor will creep up. Modern opamps show decreasing THD with levels up to the clip point. If a design doesn't do that, something was missed. A sweep through an audio analyzer using a THD vs amplitude test will show if your ADC inputs are behaving differently at different signal levels. Then re-check with a THD vs frequency sweep to determine if it falls apart at higher frequencies.

I run my BurrBrown converters very hard at +14~16 dbu, about 4 to 6 db below the zero line. They sound the same if I lower the levels, but the noise increases.

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