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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8774 датащи(PDF) 39 Page - Wolfson Microelectronics plc |
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WM8774 датащи(HTML) 39 Page - Wolfson Microelectronics plc |
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39 / 42 page  Product Preview 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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