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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AD9689-2000EBZ 데이터시트(PDF) 58 Page - Analog Devices |
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AD9689-2000EBZ 데이터시트(HTML) 58 Page - Analog Devices |
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58 / 134 page  AD9689 Data Sheet Rev. A | Page 58 of 134 HB1 Filter Description The fourth and final decimate by 2, half-band, low-pass, FIR filter (HB1) uses a 63-tap, symmetrical, fixed coefficient filter implementation that is optimized for low power consumption. The HB1 filter is always enabled and cannot be bypassed. Table 21 and Figure 122 show the coefficients and response of the HB1 filter. Table 21. HB1 Filter Coefficients HB1 Coefficient Number Normalized Coefficient Decimal Coefficient (20-Bit) C1, C63 −0.000019 −10 C2, C62 0 0 C3, C61 0.000072 38 C4, C60 0 0 C5, C59 −0.000195 −102 C6, C58 0 0 C7, C57 0.000443 232 C8, C56 0 0 C9, C55 −0.000891 −467 C10, C54 0 0 C11, C53 0.001644 862 C12, C52 0 0 C13, C51 −0.002840 −1489 C14, C50 0 0 C15, C49 0.004654 2440 C16, C48 0 0 C17, C47 −0.007311 −3833 C18, C46 0 0 C19, C45 0.011122 5831 C20, C44 0 0 C21, C43 −0.016554 −8679 C22, C42 0 0 C23, C41 0.024420 12803 C24, C40 0 0 C25, C39 −0.036404 −19086 C26, C38 0 0 C27, C37 0.056866 29814 C28, C36 0 0 C29, C35 −0.101892 −53421 C30, C34 0 0 C31, C33 0.316883 166138 C32 0.5 262144 –160 –140 –120 –100 –80 –60 –40 –20 0 20 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 NORMALIZED FREQUENCY (× Π RAD/s) Figure 122. HB1 Filter Response TB2 Filter Description The TB2 filter uses a 26-tap, symmetrical, fixed coefficient filter implementation that is optimized for low power consumption. The TB2 filter is only used when decimation ratios of 6, 12, or 24 are required. Table 22 and Figure 123 show the coefficients and response of the TB2 filter. Table 22. TB2 Filter Coefficients TB2 Coefficient Number Normalized Coefficient Decimal Coefficient (19-Bit) C1, C26 −0.000191 −50 C2, C25 −0.000793 −208 C3, C24 −0.001137 −298 C4, C23 0.000916 240 C5, C22 0.006290 1649 C6, C21 0.009823 2575 C7, C20 0.000916 240 C8, C19 −0.023483 −6156 C9, C18 −0.043152 −11312 C10, C17 −0.019318 −5064 C11, C16 0.071327 18698 C12, C15 0.201172 52736 C13, C14 0.297756 78055 –160 –140 –120 –100 –80 –60 –40 –20 0 20 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 NORMALIZED FREQUENCY (× Π RAD/s) Figure 123. TB2 Filter Response |
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