Filter
Top Products
7-9
Fig. 7-3-9 Block diagram of TDA4672
7-3-6. RGB Demodulation
The demodulation from Y and color difference signals to
RGB signals is carried out by QV008, TDA4780. Fig. 7-
3-10 shows the pin configuration of TDA4780 and Fig.
7-3-11 shows the block diagram. The TDA4780 performs
the RGB demodulation and adjusts color, contrast, and
brightness.
Fig. 7-3-10 Pin configuration of TDA4780
SAND CASTLE PULSE
DETECTOR
Sand castle
pulse
I
2
C • BUS
100 nF
SDA SCL V = 5V to 8V
P
100 nF
V
REF
GENERATION
V
REF
CORING
CORING
I
2
C • BUS
BLACK
LEVEL
CLAMP
100 nF
I
2
C • BUS
PEAKING
Y
-(R-Y)
-(B-Y)
TDA4672
+1
-0.5
-0.5
Peaking
frequency
5 MHz
2.6 MHz
5 MHz
2.6 MHz
Coring
on / off
Sand castle
5V / 12V
I
2
C • BUS RECEIVERS
REF
V
100
ns
90
ns
100
ns
90
ns
45
ns
90
ns
180
ns
BLACK
LEVEL
CLAMP
180
ns
450
ns
-(R-Y)
-(B-Y)
100 nF
100 nF
REF
V
Y
100 nF
REF
V
Control signal
REF
V
Y delay
DELAY TIME
CONTROL
BK.H+V
BK
BLACK LEVEL
CLAMP
NC
MED758
11
12
4
6
8185
3
7
14
13
16
17 2 910 1 15
SCL
SDA
YHUE
Cl
BCL
R
C
O
R
G
C
O
G
B
C
O
B
POST
C
L
C
PDL
C
-(B-Y)
-(R-Y)
Y
GND
SC
2
FSW
2
R
2
G
2
B
P
V
1
R
1
G
1
B
TDA4780
1
FSW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14