参数资料
型号: ADAU1401AWBSTZ-RL
厂商: Analog Devices Inc
文件页数: 14/52页
文件大小: 0K
描述: IC AUDIO PROC 28/56BIT 48LQFP
标准包装: 2,000
系列: SigmaDSP®
类型: 音频处理器
应用: 监控器,电视
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 带卷 (TR)
ADAU1401A
Rev. A | Page 21 of 52
AUDIO DACs
The ADAU1401A includes four Σ-Δ DACs. The SNR of the
DACs 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 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, the DS[1:0] bits in the DAC
setup register (Address 2087) should be set to 01.
47F
+
560
DAC_OUT
5.6nF
FILTER_OUT
08
50
6-
01
8
Figure 18. Passive DAC Output Filter
47F
+
604
DAC_OUT
49.9k
3.3nF
FILTER_OUT
4.75k
150pF
AD8608
C8
470F
+
08
50
6-
0
19
Figure 19. Active DAC Output Filter
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