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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8778SEDS/R 데이터시트(PDF) 49 Page - Wolfson Microelectronics plc |
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WM8778SEDS/R 데이터시트(HTML) 49 Page - Wolfson Microelectronics plc |
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49 / 50 page  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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