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ADAU1701 Datasheet

  • ADAU1701

  • SigmaDSP? 28/56-Bit Audio Processor with 2ADC/4DAC

  • 40頁

  • AD

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ADAU1701
FOUR-CHANNEL AUDIO DAC
The ADAU1701鈥檚 main output is a four-channel 危-螖 DAC. The
SNR of the DAC is 104 dB and the THD+N is -90 dB. A full-
scale output on the DACs is 0.9 Vrms (2.5 Vp-p).
The DACs are in an inverting configuration. If a signal
inversion from input to output is undesirable, this can be
reversed by using either an inverting configuration in the
output filter, or by simply inverting the signal in the SigmaDSP
program flow.
The DAC outputs can be filtered with either an active or a
passive reconstruction filter. A single-pole low-pass filter with a
50 kHz corner frequency, as shown in Figure 20, is sufficient to
Preliminary Technical Data
filter the DAC鈥檚 out-of-band noise, although an active filter may
provide better audio performance. Figure 21 shows a 3-pole
active low-pass filter that will provide a steeper roll-off and
better stop-band attenuation than the passive filter.
Figure 20. DAC output filter - passive
Figure 21. DAC output filter 鈥?active
Rev. PrF | Page 18 of 43

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