MC144144P Ver la hoja de datos (PDF) - Motorola => Freescale

Número de pieza

componentes Descripción

Fabricante

MC144144P

Enhanced Closed-Caption Decoder CMOS

Motorola => Freescale 

100 IRE

(REFERENCE WHITE)

0 IRE

(BLANKING LEVEL)

–40 IRE

COLOR

BURST

13.5 µs

CELL WIDTH = 1.324 µs

CHAR LUM = 42.370 µs

BOX = 45.018 µs

35.73 µs

CENTER OF ACTIVE VIDEO

COMPOSITE

VIDEO A

LOW–PASS

FILTER

VIDEO

IN

MC144144

OUTPUTS

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.

Figure 1. Timing of Output Signals Relative to Composite Video at Point A

MC144144

6

MOTOROLA

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