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PDF MC1377DW Data sheet ( Hoja de datos )
| Número de pieza | MC1377DW | |
| Descripción | COLOR TELEVISION RGB to PAL/NTSC ENCODER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Order this document by MC1377/D
MC1377
Color Television RGB to
PAL/NTSC Encoder
The MC1377 will generate a composite video from baseband red, green,
blue, and sync inputs. On board features include: a color subcarrier
oscillator; voltage controlled 90° phase shifter; two double sideband
suppressed carrier (DSBSC) chroma modulators; and RGB input matrices
with blanking level clamps. Such features permit system design with few
external components and accordingly, system performance comparable to
studio equipment with external components common in receiver systems.
• Self–contained or Externally Driven Reference Oscillator
• Chroma Axes, Nominally 90° (±5°), are Optionally Trimable
• PAL/NTSC Compatible
• Internal 8.2 V Regulator
COLOR TELEVISION
RGB to PAL/NTSC ENCODER
SEMICONDUCTOR
TECHNICAL DATA
20
1
P SUFFIX
PLASTIC PACKAGE
CASE 738
20
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC1377DW
MC1377P
TA = 0° to +70°C
SO–20L
Plastic DIP
Figure 1. Representative Block Diagram
Quad
Decoup
19
VCC VB
14 16
18
Oscout
17
Oscin
Oscillator
Buffer
20
NTSC/PAL
Select
H/2
PAL/NTSC
Control
Voltage
Controlled
90°
Burst
Pulse
Driver
Gnd
15
Latching
Ramp
Generator
1
Trise
Dual
Comparator
2
Composite
Sync Input
MOTOROLA ANALOG IC DEVICE DATA
8.2V
Regulator
PAL
Switch
0/180°
Chroma
Amp
90°
R–Y
0°
B–Y
B–Y
Clamp
R–Y B–Y
Color Difference and
Luminance Matrix
R–Y
Clamp
–Y
Output Amp/
Clamp
34
RG
Inputs
56
B –Yout
8
–Yin
© Motorola, Inc. 1995
13
Chroma Out
10
Chroma In
11
B–Y Clamp
12
R–Y Clamp
9 Composite
Video Output
Video Clamp
7
1
1 page  
MC1377
Timing Circuitry
The composite sync input at Pin 2 performs three
important functions: it provides the timing (but not the
amplitude) for the sync in the final output; it drives the black
level clamps in the modulators and output amplifier; and it
triggers the ramp generator at Pin 1, which produces burst
envelope and PAL switching. A representative block diagram
of the timing circuitry is shown in Figure 5.
In order to produce a color burst, a burst envelope must be
generated which “gates” a color subcarrier into the R–Y and
B–Y modulators. This is done with the ramp generator at
Pin 1.
The ramp generator at Pin 1 is an R–C type in which the
pin is held low until the arrival of the leading edge of sync. The
rising ramp function, with time constant R–C, passes through
two level sensors – the first one starts the gating pulse and
the second stops it (see Figure 10). Since the “early” part of
the exponential is used, the timing provided is relatively
accurate from chip–to–chip and assembly–to–assembly.
Fixed components are usually adequate. The ramp
continues to rise for more than half of the line interval, thereby
inhibiting burst generation on “half interval” pulses on vertical
front and back porches. The ramp method will produce burst
on the vertical front and back “porches” at full line intervals.
R–Y, B–Y Clamps and Output Clamp/Amplifier
The sync signal, shown in the block diagram of Figure 6,
drives the R–Y and B–Y clamps which clamp the R–Y and
B–Y signals to reference black during the blanking periods.
The output amplifier/clamp provides this same function plus
combines and amplifies the chroma and luma components
for composite video output.
Application Circuit
Figure 7 illustrates the block diagram of the MC1377 and
the external circuitry required for typical operation.
Figure 5. Timing Circuitry
PAL/
NTSC
20
Sync
Input
2
VB
R
H/2
PAL/NTSC
Control
Line Drive
10k Latching
Ramp
Generator
Burst
Pulse
Driver
Burst Flag
Dual
Comparator
C1
Figure 6. R–Y, B–Y and Output Amplifier Clamps
Chroma
10
B–Y
B–Y 11
Clamp
0.1
R–Y
R–Y 12
Clamp
0.1
9 Composite
Sync
Output
Amp/Clamp
Video
7
0.01
8
–Y
Figure 7. Block Diagram and Application Circuit
3.58/
4.43*
0.01VCC
VB
MHz
19 14 16 0.1
TOKO 166NNF
–10264AG
17
220
18
220
20
5.0 to
25pF
NTSC/
PAL Select
15
Osc/
Buffer
H/2
PAL/NTS
C
Control
Latching
Ramp
Gen
Voltage
Controlled
90°
Burst
Pulse
Driver
Dual
Comparator
1
0.001
mica
56k
* Refers to the choice NTSC/PAL
* (3.58 MHz/4.43 MHz).
2
VB
Composite
Sync
Input
8.2V
Regulator
90°
R–Y
0°
B–Y
R–Y B–Y
Color Difference and
Luminance Matrix
–Y
3+ 4 + 5 + 6
15µF 15µF 15µF
1.0k
R GB
R, G, B Inputs
PAL
Switch
0/180°
Chroma
Amp
13 220
100/
62*
B–Y
Clamp
10
11 1000
0.1
R–Y
Clamp
Output Amp/
Clamp
–Y
8
1.0k
400ns
Y Delay
12
0.1
9
7 0.01
0.1
47/33*
3.3k
Composite
Video Output
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC1377
Figure 14. Optional Chroma Coupling Circuits
0.001
13
1.0k
0.001
10
with an effective source impedance of less than 1.0 Ω. This
regulator is convenient for a tracking dc reference for dc
coupling the output to an RF modulator. Typical turn–on drift
for the regulator is approximately –30 mV over 1 to 2 minutes
in otherwise stable ambient conditions.
22µH
a) Insertion Loss: 3.0 dB
a) Bandwidth: ± 1.0 MHz
a) Delay: ≈ 100 ns
39pF
Figure 15. Output Termination
56pF
13
1.0k
0.001
10
4.7k
b) Insertion Loss: 9.0 dB
b) Bandwidth: ± 2.0 MHz
b) Delay: 0
27pF
Power Supplies
The MC1377 is designed to operate from an unregulated
10 V to 14 Vdc power supply. Device current into Pin 14 with
open output is typically 35 mA. To provide a stable reference
for the ramp generator and the video output, a high quality
8.2 V regulator can supply up to 10 mA for external uses,
4.7k
MC1377
Output
9 75
75Ω Cable
75
Monitor
SUMMARY
The preceding information was intended to detail the
application and basis of circuit choices for the MC1377. A
complete MC1377 application with the MC1374 VHF
modulator is illustrated in Figure 17. The internal schematic
diagram of the MC1377 is provided in Figure 8.
Figure 16. Application with VHF Modulator
47k
3.58MHz
10
0.1
220
5–25 220
+ 0.1
S
R 15 +
17
18
2
3
G 15 + 4
3.3k B 15 +
47
0.001
5
10
13
100 220
20
16
1
MC1377
9
8
14 6
Color Bandpass
11 12 19 15 7
Transformer (Fig. 24)
+12Vdc
0.1 .01
0.1
.01
PAL
NTSC
470
470
470 0.12µH
+12Vdc
VCC
0.001
56
8.2VRef
53k
2.7k
0.1
2.2k
47
6.8k
120
6 74 8
1
9
3
10µH
0.001 MC1374
mica
2
0.001
12
11
Delay Line
1.2k 1.2k
14 13
75 5 10
+
1.0
Video
Out
Audio
In
75
0.33µH 0.33µH
0.001 RF
Out
22 47 22
5.1k
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
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