參數(shù)資料
型號(hào): EVAL-ADAU1401EBZ
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 15/52頁(yè)
文件大小: 0K
描述: BOARD EVAL FOR ADAU1401
標(biāo)準(zhǔn)包裝: 1
系列: SigmaDSP®
主要目的: 音頻編解碼器
嵌入式: 是,DSP
已用 IC / 零件: ADAU1401
主要屬性: 在 50-MIPS 時(shí)的 28/56 位音頻處理器,2 ADC,4 DAC
次要屬性: 均衡,交叉,低音增強(qiáng),多頻帶動(dòng)態(tài)處理,延遲等
已供物品: 2 個(gè)板,線(xiàn)纜,電源
ADAU1401
Data Sheet
Rev. C | Page 22 of 52
AUDIO DACs
The ADAU1401 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 either by
using 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
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.
47F
+
560
DAC_OUT
06
75
2-
0
18
5.6nF
FILTER_OUT
Figure 18. Passive DAC Output Filter
47F
+
604
DAC_OUT
49.9k
3.3nF
FILTER_OUT
4.75k
0
67
52
-01
9
150pF
AD8606
C8
470F
+
Figure 19. Active DAC Output Filter
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