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WM8771 Datasheet(PDF) 42 Page - Wolfson Microelectronics plc |
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WM8771 Datasheet(HTML) 42 Page - Wolfson Microelectronics plc |
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42 / 44 page  WM8771 Product Preview w PP Rev 2.0 December 2001 42 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 WM8771 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 24 shows a suitable post DAC filter circuit, with 2x gain. Alternative inverting filter architectures might also be used with as good results. Figure 36 Recommended post DAC filter circuit 7.5k Ω Ω Ω Ω 1.8k Ω Ω Ω Ω 10uF 1.0nF 47k Ω Ω Ω Ω 4.7k Ω Ω Ω Ω 680pF 4.7k Ω Ω Ω Ω 51 OP_FIL VOUT1L OP_FIL VOUT1R OP_FIL VOUT2R OP_FIL VOUT2L OP_FIL VOUT3L OP_FIL VOUT3R OP_FIL VOUT4L OP_FIL VOUT4R |
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