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HMP8170 Datasheet(PDF) 8 Page - Intersil Corporation |
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HMP8170 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 33 page  8 . Color Subcarrier Generation The HMP8170 uses a numerically controlled oscillator (NCO) clocked by CLK2 and a sine look up ROM to generate the color subcarrier. As shown in Figure 9, the phase increment value (PHINC) of the NCO may come from the encoder’s internal look up table, BT.656 ancillary data, or a control register. The PHINC source is selected in timing I/O register 2. . FIGURE 7A. FULL SPECTRUM FIGURE 7B. PASS BAND FIGURE 7. Y LOWPASS FILTER RESPONSE NTSC SQUARE PIXEL CLK2 = 24.54MHz NTSC OR PAL CLK2 = 27.00MHz PAL SQUARE PIXEL CLK2 = 29.50MHz RECTANGULAR PIXEL 0 -10 -20 -30 -40 -50 -60 02 46 8 10 12 14 FREQUENCY (MHz) 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 0 1 23 4 5 67 FREQUENCY (MHz) NTSC SQUARE PIXEL CLK2 = 24.54MHz NTSC OR PAL CLK2 = 27.00MHz PAL SQUARE PIXEL CLK2 = 29.50MHz RECTANGULAR PIXEL FIGURE 8A. FULL SPECTRUM FIGURE 8B. PASS BAND FIGURE 8. Cb AND Cr LOWPASS FILTER RESPONSE 02 4 6 8 10 12 FREQUENCY (MHz) 0 -10 -20 -30 -40 -50 -60 NTSC SQUARE PIXEL CLK2 = 24.54MHz NTSC OR PAL CLK2 = 27.00MHz RECTANGULAR PIXEL PAL SQUARE PIXEL CLK2 = 29.50MHz 0 0.2 0.4 0.6 0.8 1.0 1.2 FREQUENCY (MHz) 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 NTSC SQUARE PIXEL CLK2 = 24.54MHz NTSC OR PAL CLK2 = 27.00MHz RECTANGULAR PIXEL -3.5 -4.0 1.4 1.6 PAL SQUARE PIXEL CLK2 = 29.50MHz FIGURE 9. COLOR SUBCARRIER GENERATION NCO. + INTERNAL BT.656 I2C PHINC SELECT PHINC D Q CLK2 NCO RESET PHINT HMP8170 |
Similar Part No. - HMP8170_03 |
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Similar Description - HMP8170_03 |
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