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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9670EBZ датащи(PDF) 25 Page - Analog Devices |
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AD9670EBZ датащи(HTML) 25 Page - Analog Devices |
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25 / 48 page  AD9674 Data Sheet Rev. A | Page 24 of 47 Antialiasing Filter (AAF) The filter that the signal reaches prior to the ADC is used to reject dc signals and to band limit the signal for antialiasing. The antialiasing filter is a combination of a single-pole high-pass filter and a second-order low-pass filter. The high-pass filter can be configured as a ratio of the low-pass filter cutoff frequency. This is selectable using Address 0x02B, Bits[1:0]. The filter uses on-chip tuning to trim the capacitors and set the desired low-pass cutoff frequency and reduce variations. The default −3 dB low-pass filter cutoff is 1/3, 1/4.5, or 1/6 of the ADC sample clock rate. The cutoff can be scaled to 0.75, 0.8, 0.9, 1.0, 1.13, 1.25, or 1.45 times this frequency using Address 0x00F. The cutoff tolerance (±10%) is maintained from 8 MHz to 18 MHz for low band mode or 13.5 MHz to 30 MHz for high band mode. Table 11 and Table 12 calculate the valid SPI-selectable low-pass filter settings and the expected cutoff frequencies for low band mode and high band mode at the minimum and the maximum sample frequency in each speed mode. Table 11. SPI-Selectable Low-Pass Filter Cutoff Options for Low Band Mode at Example Sampling Frequencies Address 0x00F[7:3] LPF Cutoff Frequency (MHz) Sampling Frequency (MHz) 20.5 40 65 80 125 0 0000 1.45 × (1/3) × fSAMPLE 9.91 Out of tunable filter range Out of tunable filter range Out of tunable filter range Out of tunable filter range 0 0001 1.25 × (1/3) × fSAMPLE 8.54 16.67 Out of tunable filter range Out of tunable filter range Out of tunable filter range 0 0010 1.13 × (1/3) × fSAMPLE Out of tunable filter range 15.00 Out of tunable filter range Out of tunable filter range Out of tunable filter range 0 0011 1.0 × (1/3) × fSAMPLE Out of tunable filter range 13.33 Out of tunable filter range Out of tunable filter range Out of tunable filter range 0 0100 0.9 × (1/3) × fSAMPLE Out of tunable filter range 12.00 Out of tunable filter range Out of tunable filter range Out of tunable filter range 0 0101 0.8 × (1/3) × fSAMPLE Out of tunable filter range 10.67 17.33 Out of tunable filter range Out of tunable filter range 0 0110 0.75 × (1/3) × fSAMPLE Out of tunable filter range 10.00 16.25 16.82 Out of tunable filter range 0 1000 1.45 × (1/4.5) × fSAMPLE Out of tunable filter range 12.89 20.94 Out of tunable filter range Out of tunable filter range 0 1001 1.25 × (1/4.5) × fSAMPLE Out of tunable filter range 11.11 18.06 Out of tunable filter range Out of tunable filter range 0 1010 1.13 × (1/4.5) × fSAMPLE Out of tunable filter range 10.00 16.25 Out of tunable filter range Out of tunable filter range 0 1011 1.0 × (1/4.5) × fSAMPLE Out of tunable filter range 8.89 14.44 17.78 Out of tunable filter range 0 1100 0.9 × (1/4.5) × fSAMPLE Out of tunable filter range 8.00 13.00 16.00 Out of tunable filter range 0 1101 0.8 × (1/4.5) × fSAMPLE Out of tunable filter range Out of tunable filter range 11.56 14.22 Out of tunable filter range 0 1110 0.75 × (1/4.5) × fSAMPLE Out of tunable filter range Out of tunable filter range 10.83 13.33 17.50 1 0000 1.45 × (1/6) × fSAMPLE Out of tunable filter range 9.67 15.71 Out of tunable filter range Out of tunable filter range 1 0001 1.25 × (1/6) × fSAMPLE Out of tunable filter range 8.33 13.54 16.67 Out of tunable filter range 1 0010 1.13 × (1/6) × fSAMPLE Out of tunable filter range Out of tunable filter range 12.19 15.00 Out of tunable filter range 1 0011 1.0 × (1/6) × fSAMPLE Out of tunable filter range Out of tunable filter range 10.83 13.33 Out of tunable filter range 1 0100 0.9 × (1/6) × fSAMPLE Out of tunable filter range Out of tunable filter range 9.75 12.00 Out of tunable filter range 1 0101 0.8 × (1/6) × fSAMPLE Out of tunable filter range Out of tunable filter range 8.67 10.67 16.67 1 0110 0.75 × (1/6) × fSAMPLE Out of tunable filter range Out of tunable filter range 8.13 10.00 15.63 |
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