參數(shù)資料
型號: ADAU1702JSTZ
廠商: ANALOG DEVICES INC
元件分類: 消費家電
英文描述: SigmaDSP 28-56-Bit Audio Processor with Two ADCs and Four DACs
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝: ROHS COMPLIANT, PLASTIC, MS-026BBC, LQFP-48
文件頁數(shù): 20/52頁
文件大?。?/td> 773K
代理商: ADAU1702JSTZ
ADAU1702
AUDIO DACS
The ADAU1702 includes four Σ-Δ DACs. 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 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
Rev. 0 | Page 20 of 52
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 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.
47μF
+
560
DAC_OUT
0
5.6nF
FILTER_OUT
Figure 18. Passive DAC Output Filter
47μF
+
604
DAC_OUT
49.9k
3.3nF
FILTER_OUT
4.75k
4.75k
0
150pF
AD8606
C8
470μF
+
Figure 19. Active DAC Output Filter
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