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WM8774IFT 데이터시트(PDF) 39 Page - Wolfson Microelectronics plc

부품명 WM8774IFT
상세설명  24 - bit, 192kHz 8 - Channel Input Stereo Codec
PDF  42 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8774IFT 데이터시트(HTML) 39 Page - Wolfson Microelectronics plc

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WM8774
PP Rev 1.0 June 2002
39
RECOMMENDED EXTERNAL COMPONENTS
It is recommended that a lowpass filter be applied to the output from each DAC channel for Hi Fi
applications. Typically a second order filter is suitable and provides sufficient attenuation of high
frequency components (the unique low order, high bit count multi-bit sigma delta DAC structure used
in WM8774 produces much less high frequency output noise than competitors devices). This filter is
typically also used to provide the 2x gain needed to provide the standard 2Vrms output level from
most consumer equipment. Figure 34 shows a suitable post DAC filter circuit, with 2x gain.
Alternative inverting filter architectures might also be used with as good results.
+
_
+
+VS
-VS
10uF
51
Ω
7.5K
Ω
680pF
1.8k
Ω
47k
Ω
4.7k
Ω
4.7k
Ω
1.0nF
Figure 34 Recommended Post DAC Filter Circuit



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