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ADAU1702 Datasheet

  • ADAU1702

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

  • 694.40KB

  • 38頁

  • AD

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ADAU1702
AUDIO DACS
The ADAU1702 includes four 危-螖 DACs. The SNR of the DAC
is 104 dB and the THD + N is 鈭?0 dB. A full-scale output on the
DACs is 0.9 V
rms
(2.5 V
p-p
).
The DACs are in an inverting configuration. If a signal inversion
from input to output is undesirable, it can be reversed by using
either an inverting configuration for 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, passive low-pass
filter with a 50 kHz corner frequency, as shown in Figure 18, is
sufficient to filter the DAC out-of-band noise, although an
active filter may provide better audio performance. Figure 19
C8
470碌F
47碌F
604鈩?/div>
3.3nF
49.9k鈩?/div>
05798-011
shows a triple-pole, active, low-pass filter that provides a steeper
roll-off and better stop-band attenuation than the passive filter.
In this configuration, the V+ and V鈭?pins of the AD8606 op
amp are set to VDD and ground, respectively.
To properly initialize the DACs, Bits DS [1:0] in the DAC setup
register (Address 2087) should be set to 01.
47碌F
+
DAC_OUT
560鈩?/div>
5.6nF
FILTER_OUT
05798-009
Figure 18. Passive DAC Output Filter
DAC_OUT
4.75k鈩?4.75k鈩?/div>
150pF
+
AD8606
Figure 19. Active DAC Output Filter
Rev. 0 | Page 20 of 52
+
FILTER_OUT

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