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WM8776 Datasheet(PDF) 55 Page - Wolfson Microelectronics plc |
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WM8776 Datasheet(HTML) 55 Page - Wolfson Microelectronics plc |
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55 / 57 page  Production Data WM8776 w PD Rev 4.0 April 2005 55 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 WM8776 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 44 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 44 Recommended Post DAC Filter Circuit |
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