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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9887/PCB датащи(PDF) 16 Page - Analog Devices |
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AD9887/PCB датащи(HTML) 16 Page - Analog Devices |
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16 / 40 page  REV. 0 –16– AD9887 Table V. VCO Frequency Ranges Pixel Clock KVCO Gain PV1 PV0 Range (MHz) (MHz/V) 0 0 12–35 150 0 1 35–70 150 1 0 70–110 150 1 1 110–140 180 Table VI. Charge Pump Current/Control Bits Ip2 Ip1 Ip0 Current ( A) 00 0 50 0 0 1 100 0 1 0 150 0 1 1 250 1 0 0 350 1 0 1 500 1 1 0 750 1 1 1 1500 3. The 3-Bit Charge Pump Current Register. This register allows the current that drives the low pass loop filter to be varied. The possible current values are listed in Table VI. provides 32 phase-shift steps of 11.25 ° each. The Hsync signal with an identical phase shift is available through the HSOUT pin. Phase adjustment is still available if the pixel clock is being provided externally. 4. The 5-Bit Phase Adjust Register. The phase of the generated sampling clock may be shifted to locate an optimum sam- pling point within a clock cycle. The Phase Adjust register The COAST allows the PLL to continue to run at the same frequency, in the absence of the incoming Hsync signal. This may be used during the vertical sync period, or any other time that the Hsync signal is unavailable. The polarity of the COAST signal may be set through the Coast Polarity Bit. Also, the polarity of the Hsync signal may be set through the HSYNC polarity Bit. If not using automatic polarity detection, the HSYNC and COAST polarity bits should be set to match the Polarity of their respective signals. Table VII. Recommended VCO Range and Charge Pump Current Settings for Standard Display Formats Horizontal Refresh Frequency Pixel Rate Standard Resolution Rate (Hz) (kHz) (MHz) VCORNGE CURRENT VGA 640 × 480 60 31.5 25.175 00 101 72 37.7 31.500 00 101 75 37.5 31.500 00 110 85 43.3 36.000 00 110 SVGA 800 × 600 56 35.1 36.000 00 101 60 37.9 40.000 01 101 72 48.1 50.000 01 101 75 46.9 49.500 01 101 85 53.7 56.250 01 110 XGA 1024 × 768 60 48.4 65.000 01 110 70 56.5 75.000 10 101 75 60.0 78.750 10 101 80 64.0 85.500 10 101 85 68.3 94.500 10 101 SXGA 1280 × 1024 60 64.0 108.000 10 110 75 80.0 135.000 11 110 85 91.1 157.500 * 10 110 UXGA 1600 × 1200 60 75.0 162.000 * 10 110 65 81.3 175.500 * 10 110 70 87.5 189.000 * 10 110 75 93.8 202.500 * 10 110 85 106.3 229.500 * 11 110 *Graphics sampled at one-half the incoming pixel rate using Alternate Pixel Sampling mode. |
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