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AD9675KBCZ Datasheet(PDF) 26 Page - Analog Devices |
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AD9675KBCZ Datasheet(HTML) 26 Page - Analog Devices |
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26 / 61 page  Data Sheet AD9675 Rev. A | Page 25 of 60 Table 11 and Table 12 calculate the valid SPI-selectable low-pass filter settings and expected cutoff frequencies for the low bandwidth and high bandwidth modes at the minimum sample frequency and the maximum sample frequency in each speed mode. Tuning is normally off to avoid changing the capacitor settings during critical times. The tuning circuit is enabled through the SPI. It is disabled automatically after 512 cycles of the ADC sample clock. Initialize the tuning of the filter after initial power-up and after reprogramming of the filter cutoff scaling or the ADC sample rate. The tuning is initiated using Address 0x02B, Bit 6. Four SPI-programmable settings allow users to vary the high- pass filter cutoff frequency as a function of the low-pass cutoff frequency. Two examples are shown in Table 13: an 8 MHz low- pass cutoff frequency and an 18 MHz low-pass cutoff frequency. In both cases, as the ratio decreases, the amount of rejection on the low end frequencies increases. Therefore, making the entire AAF frequency pass band narrow can reduce low frequency noise or maximize dynamic range for harmonic processing. Table 11. SPI-Selectable Low-Pass Filter Cutoff Options for Low Bandwidth 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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