MT-017 Datasheet, PDF (6/7 Pages) Analog Devices – Oversampling Interpolating DACs

MT-017
Figure 6: AD1955 Multibit Sigma-Delta Audio DAC
SUMMARY
Oversampling used in conjunction with digital filtering is a powerful tool in modern sampled
data systems. We have seen how the same fundamental theory is applicable to both ADCs and
reconstruction DACs. A primary advantage is the relaxation of the requirements on the
antialiasing/anti-imaging filter. Another advantage is the increase in SNR which occurs because
of the process gain.
The Σ-Δ ADC and DAC architecture is the ultimate extension of the oversampling concept and is
the architecture of choice for most voiceband and audio signal processing data converter
applications.
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