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Toshiba TLP511E User Manual

Page 36

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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

8

18

5

3

7

14

13

16

17

2

9

10

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

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