поискавой системы для электроныых деталей |
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AD9888KS-205 датащи(PDF) 11 Page - Analog Devices |
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AD9888KS-205 датащи(HTML) 11 Page - Analog Devices |
11 / 32 page REV. A AD9888 –11– CP 0.0039 F CZ 0.039 F FILT RZ 3.3k PVD Figure 6. PLL Loop Filter Detail Four programmable registers are provided to optimize the per- formance of the PLL. These registers are: 1. The 12-Bit Divisor Registers. The input Hsync frequencies range from 15 kHz to 110 kHz. The PLL multiplies the frequency of the Hsync signal, producing pixel clock fre- quencies in the range of 10 MHz to 205 MHz. The Divisor Register controls the exact multiplication factor. This regis- ter may be set to any value between 221 and 4095. (The divide ratio that is actually used is the programmed divide ratio plus one.) 2. The 2-Bit VCO Range Register. To lower the sensitivity of the output frequency to noise on the control signal, the VCO operating frequency range is divided into four overlapping regions. The VCO Range register sets this operating range. Because there are only four possible regions, only the two least significant bits of the VCO Range register are used. The frequency ranges for the lowest and highest regions are shown in Table II. 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 III. Table II. VCO Frequency Ranges Pixel Clock Range KVCO Gain PV1 PV0 (MHz) (MHz/V) 0 0 10–45 22.5 0 1 45–90 45 1 0 90–150 90 1 1 150+ 180 Table III. Charge Pump Current/Control Bits Ip2 Ip1 Ip0 Current ( A) 00050 001100 010150 011250 100350 101500 110750 1 1 1 1500 Table IV. Recommended VCO Range and Charge Pump Current Settings for Standard Display Formats Refresh Horizontal Standard Resolution Rate (Hz) Frequency (kHz) Pixel Rate (MHz) VCORNGE Current VGA 640 × 480 60 31.5 25.175 00 010 72 37.7 31.500 00 100 75 37.5 31.500 00 100 85 43.3 36.000 00 100 SVGA 800 × 600 56 35.1 36.000 00 100 60 37.9 40.000 00 101 72 48.1 50.000 01 011 75 46.9 49.500 01 011 85 53.7 56.250 01 011 XGA 1024 × 768 60 48.4 65.000 01 100 70 56.5 75.000 01 100 75 60.0 78.750 01 101 80 64.0 85.500 01 101 85 68.3 94.500 10 011 SXGA 1280 × 1024 60 64.0 108.000 10 011 75 80.0 135.000 10 100 85 91.1 157.500 11 100 UXGA 1600 × 1200 60 75.0 162.000 11 100 65 81.3 175.500 11 100 70 87.5 189.000 11 101 75 93.8 202.500 11 101 85 106.3 229.500* 10 110 QXGA 2048 × 1536 60 260.000* 11 100 2048 × 1536 75 315.000* 11 100 *Graphics sampled at 1/2 the incoming pixel rate using Alternate Pixel Sampling mode. |
Аналогичный номер детали - AD9888KS-205 |
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Аналогичное описание - AD9888KS-205 |
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