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參數(shù)資料
| 型號： | MC1378 |
| 廠商： | Motorola, Inc. |
| 英文描述： | COLOR TELEVISION COMPOSITE VIDEO OVERLAY SYNCHRONIZER |
| 中文描述： | 彩電視頻重疊復合同步 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 151K |
| 代理商： | MC1378 |
MC1378
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Supply Voltage
VCC
TA
Tstg
TJ(max)
PD
6.0
Vdc
Operating Temperature
0 to +70
°
C
Storage Temperature
–65 to +150
°
C
Junction Temperature
150
°
C
Power Dissipation, Package
Derate above 25
°
C
1.25
10
W
mW/
°
C
RECOMMENDED OPERATING CONDITIONS
Condition
Pin
Value
Unit
Supply Voltage
28, 36
5.4
±
0.25
Vdc
RGB Input for 100% Saturation
14, 15, 16
1.0
Vpp
Color Oscillator Input Level
8
0.5
Vpp
Video Input, Positive
24
1.0
Vpp
ELECTRICAL CHARACTERISTICS
(VCC = 5.0 V, TA = 25
°
C, circuit of Figure 4 or 5)
Characteristics
Pin
Min
Typ
Max
Unit
Supply Current
28, 36
–
100
–
mAdc
Video Output, Open Circuit, Positive
27
–
2.0
9.4
Vpp
Modulation Angle (R – Y) to (B – Y)
–
87
90
93
Degrees
RGB Input Impedance
14, 15, 16
–
10
–
k
Local/Remote Switch (TTL)
High
Low
1
–
Remote
Local
–
–
Horizontal Sync Input, Negative Going
(TTL)
40
–
4.3
–
Vpp
Vpp
Vertical Sync Output, Negative Going,
Remote Mode
(TTL)
38
–
4.3
–
Composite Sync Output, Negative Going
(TTL)
39
–
4.3
–
Vpp
Vpp
Burst Gate Output, Positive Going
(TTL)
5
–
4.3
–
Description of Operation –
Refer to Figures 3, 4
Remote Mode
Local Mode
The incoming remote video signal (Pin 24) supplies all
synchronizing information. A discussion of the function of the
phase detectors helps to clarify the lockup method:
The MC1378 and a video system combine to provide a fully
synchronized standard signal source. In this case, composite sync
must be supplied by the video system or other time base system.
In the MC1378 the phase detectors operate as follows:
PD1
locks the internally counted–down 4 MHz horizontal VCO
to the incoming horizontal sync. It is fast acting, to follow
VCR source fluctuations.
PD1
locks the internally counted–down 4 MHz horizontal VCO
to a Horizontal Sync signal (at Pin 40) from the video
system (counted down from 36 MHz)
PD2
locks the 36 MHz clock VCO, which is divided down by
the video system, to the divided down horizontal VCO.
PD2
not used in LOCAL MODE.
PD3
not used in LOCAL MODE.
PD3
is a gated phase detector which locks the 14 MHz crystal
oscillator, divided by 4, to the incoming color burst.
PD4
active, but providing an arbitrary phase shift setting
between the color oscillator and the output burst phase.
PD4
controls an internal phase shifter to assure that the
outgoing color burst is the same phase as incoming burst
at PD3.
PD5
not used in REMOTE MODE
PD5
locks the 36 MHz clock VCO (which is divided down by
the video system) to the 14 MHz (crystal) color oscillator.
The 14 MHz is, therefore, the system standard in LOCAL
MODE, and is not DC controlled.
Vertical lock is obtained by continuously resetting the sync
generator in the video system with separated vertical sync from the
MC1378, Pin 38. This signal is TTL level vertical block sync,
negative going. The horizontal sync from the video system to Pin 40
is also TTL level with sync negative going. The local/remote switch,
Pin 1, is in local mode when grounded, remote mode when taken
to 5.0 V. The overlay control, Pin 25, has an analog characteristic,
centered about 1.0 V, which allows fading from local to remote.
COMPOSITE VIDEO GENERATION
The color encoding at the RGB signals is done exactly as in
the MC1377. Composite chroma is looped out at Pins 18 and 20
to allow the designer to choose band shaping. Luminance is
similarly brought out (Pins 17 and 22) to permit installation of
the appropriate delay.
Composite sync output, Pin 39, and burst gate output, Pin 5,
are provided for convenience only.
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