VS1011 Datasheet, PDF (31/43 Pages) List of Unclassifed Manufacturers – MP3 AUDIO CODEC

VLSI
Solution ^y
VS1011 PRELIMINARY
VS1011
8. FUNCTIONAL DESCRIPTION
8.7 Stereo Audio DAC
Decoded digital data is transformed into analog format by an 18/20-bit oversampling multi-bit sigma-
delta D/A converter. The oversampled output is low-pass filtered by an on-chip analog filter. The output
rate of the D/A converter is always 1/4 of the clock rate, or 128 times the highest usable sample rate. For
instance for a 24.576 MHz clock, the D/A converter operates at 128x48 kHz, which is 6.144 MHz. If the
input sample rate is other than 48 kHz, it is internally converted to 48 kHz by the DAC. This removes the
need for complex PLL-based clocking schemes and allows almost unlimited sample rate accuracy with
one fixed master clock frequency.
If the input ot the decoder is invalid or it is not received fast enough, analog outputs are automatically
muted.
Version 0.71, 2004-07-20
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