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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 / 53 page  AD9670 Data Sheet Rev. A | Page 24 of 52 Antialiasing Filter 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 at a ratio of the low-pass filter cutoff. This is selectable through Register 0x02B. The filter uses on-chip tuning to trim the capacitors and, in turn, to 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 through Register 0x00F. The cutoff tolerance (±10%) is maintained from 8 MHz to 18 MHz for low band mode and 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 expected cutoff frequencies for the low band and high band mode at the minimum sample frequency and the maximum sample frequency in each speed mode. |
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