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WM8778 Datasheet(PDF) 49 Page - Wolfson Microelectronics plc

No. de pieza WM8778
Descripción Electrónicos  24-bit, 192kHz Stereo CODEC
PDF  50 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8778 Datasheet(HTML) 49 Page - Wolfson Microelectronics plc

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Production Data
WM8778
w
PD Rev 4.0 April 2005
49
It is recommended that a low pass filter be applied to the output from the DAC 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
WM8778 produces much less high frequency output noise). 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
10k
Ω
4.7k
Ω
4.7k
Ω
1.0nF
Figure 40 Recommended Post DAC Filter Circuit



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