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WM8766 Datasheet(PDF) 34 Page - Wolfson Microelectronics plc |
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WM8766 Datasheet(HTML) 34 Page - Wolfson Microelectronics plc |
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34 / 36 page  WM8766 Production Data w PD Rev 4.1 July 2005 34 SUGGESTED ANALOGUE LOW PASS POST DAC FILTERS 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 WM8766 produces much less high frequency output noise than normal sigma delta DACs. This filter is typically also used to provide the 2x gain needed to provide the standard 2Vrms output level from most consumer equipment. Figure 31 shows a suitable post DAC filter circuit, with 2x gain. Alternative inverting filter architectures might also be used with as good results. 7.5k Ω Ω Ω Ω 1.8k Ω Ω Ω Ω 10uF 1.0nF 10k Ω Ω Ω Ω 4.7k Ω Ω Ω Ω 680pF 4.7k Ω Ω Ω Ω 51 Ω Ω Ω Ω OP_FIL VOUT1L OP_FIL VOUT1R OP_FIL VOUT2R OP_FIL VOUT2L OP_FIL VOUT3L OP_FIL VOUT3R Figure 31 Recommended Post DAC Filter Circuit |
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