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WM8941 Datasheet(PDF) 27 Page - Wolfson Microelectronics plc |
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WM8941 Datasheet(HTML) 27 Page - Wolfson Microelectronics plc |
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27 / 96 page  Pre Production WM8941 w PP, Rev 3.3, December 2007 27 FS (KHZ) SR=101/100 SR=011/010 SR=001/000 HPFCUT 8 11.02 5 12 16 22.0 5 24 32 44.1 48 000 82 113 122 82 113 122 82 113 122 001 102 141 153 102 141 153 102 141 153 010 131 180 156 131 180 156 131 180 156 011 163 225 245 163 225 245 163 225 245 100 204 281 306 204 281 306 204 281 306 101 261 360 392 261 360 392 261 360 392 110 327 450 490 327 450 490 327 450 490 111 408 563 612 408 563 612 408 563 612 Table 14 High Pass Filter Cut-off Frequencies (HPFAPP=1) Note that the High Pass filter values (when HPFAPP=1) work on the basis that the SR register bits are set correctly for the actual sample rate as shown in Table 14. PROGRAMMABLE NOTCH FILTERS Four programmable notch filters are provided. These filters have a programmable centre frequency and bandwidth, programmable via two coefficients, a0 and a1. a0 and a1 are represented by the register bits NFx_A0[13:0] and NFx_A1[13:0]. The notch filter coefficients should be converted to sign / magnitude notation to enter into the registers. Notch Filter 3 can also be programmed as a 1st order low pass filter. Because these coefficient values require two register writes to set up there is an NFx_UP (Notch Filter Update) flag for each filter which should be set only when both A0 and A1 for the filter have been set. The notch filters can be individually enabled, using the corresponding NFx_EN register bit, as can be seen in Figure 11: Figure 11 Labelling of Notch Filters and Arrangement of Notch Filter Enables The notch filter coefficients must be entered using a sign / magnitude notation. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 NF0_UP 0 Notch filter 0 update. The notch filter 0 values used internally only update when one of the NF0_UP bits is set high. 14 NF0_EN 0 Notch filter 0 enable: 0=Disabled 1=Enabled R16 Notch Filter 0A 13:0 NF0_A0 0 Notch Filter 0 a0 coefficient 15 NF0_UP 0 Notch filter 0 update. The notch filter 0 values used internally only update when one of the NF0_UP bits is set high. R17 Notch Filter 0B 13:0 NF0_A1 0 Notch Filter 0 a1 coefficient Table 15 Notch Filter 0 Function |
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