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WM8940CGEFL/V Datasheet(PDF) 26 Page - Wolfson Microelectronics plc |
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WM8940CGEFL/V Datasheet(HTML) 26 Page - Wolfson Microelectronics plc |
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26 / 91 page  WM8940 Production Data w PD, Rev 4.3, November 2011 26 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 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R20 Notch Filter 2A 15 NF2_UP 0 Notch filter 2 update. The notch filter 2 values used internally only update when one of the NFU bits is set high. 14 NF2_EN 0 Notch filter 2 enable. 0=Disabled 1=Enabled 13:0 NF2_A0 0 Notch filter 2 a0 coefficient R21 Notch Filter 2B 15 NF2_UP 0 Notch filter 2 update. The notch filter 2 values used internally only update when one of the NFU bits is set high. 13:0 NF2_A1 0 Notch filter 2 a1 coefficient Table 17 Notch Filter 2 Function REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R22 Notch Filter 3A 15 NF3_UP 0 Notch filter 3 update. The notch filter 3 values used internally only update when one of the NFU bits is set high. 14 NF3_EN 0 Notch filter 3 enable. 0=Disabled 1=Enabled 13:0 NF3_A0 0 Notch filter 3 a0 coefficient R23 Notch Filter 3B 15 NF3_UP 0 Notch filter 3 update. The notch filter 3 values used internally only update when one of the NFU bits is set high. 14 NF3_LP 0 Notch filter 3 mode select 0 = Notch Filter mode 1 = Low Pass Filter mode 13:0 NF3_A1 0 Notch filter 3 a1 coefficient Table 18 Notch Filter 3 Function The notch filter coefficients must be entered using a sign / magnitude notation. The MSB of the 14-bit register word (NFx_Ax[13]) is reserved for the sign part, leaving the 13 remaining bits for the magnitude part. |
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