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DISTORTION PERFORMANCE AND TESTING T he T H D+N figure of an audio DAC represents the amount of undesirable signal produced during reconstruction and play- back of an audio waveform. T herefore, the T H D+N specifica- tion provides a direct measure to classify and choose an audio DAC for a desired level ofperformance. Figure l illustrates the typical T H D+N versus frequency performance ofthe AD 1866. It is evident that the THD+N performance ofthe AD1866 re- mains stable at all three amplitude levels through a wide range of frequencies. A load impedance of at least 2 k J' is recom- mended for best T H D+N performance.