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WM8940CGEFL/V Datasheet(PDF) 27 Page - Cirrus Logic |
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WM8940CGEFL/V Datasheet(HTML) 27 Page - Cirrus Logic |
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27 / 88 page  WM8940 Rev 4.4 27 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]. 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. Notch Filter 0 Notch Filter 1 Notch Filter 2 Notch Filter 3 (or low pass) NF0_EN HPF Output To Audio Interface NF1_EN NF2_EN NF3_EN NF3_LP 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 R16 Notch Filter 0A 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 13:0 NF0_A0 0 Notch filter 0 a0 coefficient R17 Notch Filter 0B 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. 13:0 NF0_A1 0 Notch filter 0 a1 coefficient Table 15 Notch Filter 0 Function REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R18 Notch Filter 1A 15 NF1_UP 0 Notch filter 1 update. The notch filter 1 values used internally only update when one of the NFU bits is set high. 14 NF1_EN 0 Notch filter 1 enable. 0=Disabled 1=Enabled 13:0 NF1_A0 0 Notch filter 1 a0 coefficient R19 Notch Filter 1B 15 NF1_UP 0 Notch filter 1 update. The notch filter 1 values used internally only update when one of the NFU bits is set high. 13:0 NF1_A1 0 Notch filter 1 a1 coefficient Table 16 Notch Filter 1 Function |
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