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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8778EDS/R датащи(PDF) 48 Page - Wolfson Microelectronics plc |
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WM8778EDS/R датащи(HTML) 48 Page - Wolfson Microelectronics plc |
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48 / 50 page  WM8778 Product Preview w PP Rev 1.7 June 2004 48 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS 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 38 Recommended Post DAC Filter Circuit |
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