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MC144144 Scheda tecnica(PDF) 6 Page - Motorola, Inc |
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MC144144 Scheda tecnica(HTML) 6 Page - Motorola, Inc |
6 / 44 page MC144144 MOTOROLA 6 NOTES: 1. Timing parameters derived from the NAB Engineering Handbook, 7th Edition, page 5.4–75. 2. Dot period = 82.76 ns. 3. An assumption is made that the delay through the low–pass filter is 220 ns. Therefore, the timing of the output signals is normally set so that the start of the leading box preceding the first displayable character cell occurs at 13.4 to 13.7 µs after the midpoint of the leading edge of the horizontal sync pulse at Point A. The 13.4 to 13.7 µs value may be altered via a mask option; contact your Motorola representative. 100 IRE (REFERENCE WHITE) 0 IRE (BLANKING LEVEL) –40 IRE COMPOSITE VIDEO OUTPUTS COLOR BURST CELL WIDTH = 1.324 µs CHAR LUM = 42.370 µs BOX = 45.018 µs 35.73 µs A LOW–PASS FILTER MC144144 CENTER OF ACTIVE VIDEO 13.5 µs VIDEO IN Figure 1. Timing of Output Signals Relative to Composite Video at Point A |
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