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MC144144 bảng dữ liệu(PDF) 4 Page - Motorola, Inc

tên linh kiện MC144144
Giải thích chi tiết về linh kiện  Enhanced Closed-Caption Decoder CMOS
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nhà sản xuất  MOTOROLA [Motorola, Inc]
Trang chủ  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC144144 bảng dữ liệu(HTML) 4 Page - Motorola, Inc

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MC144144
MOTOROLA
4
AC AND TIMING CHARACTERISTICS
Parameter
Conditions
Composite Video Input
Amplitude:
1.0 Vp–p,
± 3 dB
Polarity:
Sync tips negative
Bandwidth:
600 kHz
Signal Type:
Interlaced
Max Input R:
470
DC Offset:
Signal to be ac coupled with a minimum series capacitance of 0.1
µF.
Non–Standard Video Signals Must Have the Following Characteristics
Sync Amplitude:
200 mV min
Vert Pulse Width:
3H
± 0.5H
Vert Pulse Tilt:
20 mV max
H Timing:
Phase Step (head switch)
± 10 µs max
Fh Deviation (long term) ± 0.5% max
Fh p–p Deviation (short term) ± 0.3% max
Horizontal Signal Input (Preferably H Flyback)
Amplitude:
CMOS level signal, low
≤ 0.2 VCC, high ≥ 0.7 VCC
Video Lock Mode:
Polarity:
Frequency:
Any
15,734.263 Hz,
± 3%
HIN Lock Mode:
Polarity:
Frequency:
Any
Display HFB pulse
Line 21 Input Parameters ( at 1.0 Vp–p)
(Line 21 must be in its proper position to the leading edge of the vertical sync signal.)
Code Amplitude:
50 IRE
± 10 IRE
Code Zero Level:
– 5 IRE, + 15 IRE relative to back porch
Bit Rate:
32 x Fh
Start of Code:
10.5
± 1.0 µs
(Measured from the midpoint of the leading edge of video H pulse to the midpoint
of the rising edge of the first clock run–in cycle.)
Start of Data:
3.972
µs, – 0.00 µs, + 0.30 µs
(Measured from the midpoint of the falling edge of the last clock run–in cycle to the
midpoint of the rising edge of the start bit.)
Input Signal–to–Random Noise Performance
Unit will function down to a 25 dB ratio
(CCIR weighted
One error per row or better at that level.
Internal Sync Circuits
The internal sync circuits will lock to
all 525 line or 625 line signals having
a vertical sync pulse.
It is at least 2 H long.
It starts at the proper 2 H boundary for its field.
If equalizing pulse serrations are present they must be less than 0.125 H in width.
Timing Signals
Dot Clock:
768 x FH = 12.0839 MHz
Dot Period:
82.75 ns
Character Cell Width:
1.324
µs (tH ÷ 48)
Width of Row (Box):
45.018
µs (34 chars = 17/24 x tH)
Width of Row (Char):
42.370
µs (32 chars = 2/3 x tH)


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