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WM8771 bảng dữ liệu(PDF) 42 Page - Wolfson Microelectronics plc

tên linh kiện WM8771
Giải thích chi tiết về linh kiện  24-bit, 192kHz 8-Channel Codec
PDF  44 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8771 bảng dữ liệu(HTML) 42 Page - Wolfson Microelectronics plc

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WM8771
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PP Rev 2.0 December 2001
42
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 WM8771 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 24 shows a suitable post DAC filter circuit, with 2x gain.
Alternative inverting filter architectures might also be used with as good results.
Figure 36 Recommended post DAC filter circuit
7.5k
Ω
Ω
Ω
Ω
1.8k
Ω
Ω
Ω
Ω
10uF
1.0nF
47k
Ω
Ω
Ω
Ω
4.7k
Ω
Ω
Ω
Ω
680pF
4.7k
Ω
Ω
Ω
Ω
51
OP_FIL
VOUT1L
OP_FIL
VOUT1R
OP_FIL
VOUT2R
OP_FIL
VOUT2L
OP_FIL
VOUT3L
OP_FIL
VOUT3R
OP_FIL
VOUT4L
OP_FIL
VOUT4R



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