TDA4780/V4 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA4780/V4

RGB video processor with automatic cut-off control and gamma adjust

Philips Electronics 

Philips Semiconductors

RGB video processor with automatic

cut-off control and gamma adjust

BLOCK DIAGRAM

Preliminary specification

TDA4780

handbook, full pagewidth

FSW1

FSW2

FSW1

13

FSW2

1

Y - output /

peak dark hue adjust

storage

output

VP = 8 V

1 µF

CPDST YHUE GND VP

18

26

9

5

200 µF

TDA4780

10 nF

R1

10 nF

G1

10 nF

B1

10 nF

R2

10 nF

G2

10 nF

B2

R1 10

G1 11

B1 12

R2 2

G2 3

B2 4

−(B − Y)

−(R − Y)

Y

10 nF −(B − Y) 6

10 nF −(R − Y) 7

47 nF

Y8

CLAMP

CLAMP

CLAMP

0.45 V Y

1.43 V

R

PAL / SECAM

NTSC

G

MATRIX B

NMEN

INPUT

SELECTOR

DELOF HDTV

SC5 FSBL

YHI

YEXH RELC

BCOF TCPL

CONTROL REGISTERS

YEXH

SUPPLY

HUE

ADJUST

BANDGAP

REFERENCE

Y

Y - MATRIX

Y ADAPTIVE

BLACK

R

R−Y

G

COLOUR

DIFFERENCE

G−Y

B

MATRIX

B−Y

ADBL

UGAP

a

YBL

GAMMA

Y

gamma

BL

R

b

SATURATION G c

ADJUST

Bd

8 DATA

6 DATA

e

f

REGISTERS

DIGITAL TO ANALOG CONVERTERS

g

UGAP

CL

SC5

h

BREN

I2C-BUS V

RECEIVER

SANDCASTLE HV

i

DETECTOR

(H)

DELOF

j

28

SCL

27

SDA

I2C-bus

14

SC

sandcastle input

MGE875

1997 Feb 06

Fig.1 Block diagram (continued in Fig.2).

4

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