This application bulletin will provide the reader with anunderstanding of test methods for audio digital-to-analogconverters (DACs). In particular, delta-sigma (DS) DACsrequire a special understanding due to the nature of theirarchitecture. The dynamic specifications of interest for anaudio DAC are THD+N (total harmonic distortion + noise),dynamic range, channel separation, and idle channel noise(often referred to as SNR, signal-to-noise ratio). There aremany possible digital audio applications, but only CD-DA(reproduction of digital audio from a compact disc) has astandard specification defined by EIAJ (Electronic IndustryAssociation of Japan).
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