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

Preliminary specification

TDA4780

handbook, full pagewidth average beam

current limiting

input

BCL

15

AVERAGE

BEAM

CURRENT

LIMITING

peak drive

limiting storage

1 µF

CPDL

16

PEAK DRIVE

LIMITER

ABSOLUTE LEVEL

RELC

MINIMUM

DETECTOR

PEAK DRIVE

LIMITER

CUT-OFF RELATED

TDA4780

VOLTAGE

COMPARATOR

VOLTAGE

COMPARATOR

TCPL RELC

a

WHITE R

POINT

ADJUST

OUTPUT

BUFFER

b

R

R

c

CONTRAST G

BRIGHTNESS G

ADJUST

ADJUST

B

B

d

MOD2

B

BLUE B

STRETCH

e

f

MP

BLANK

WHITE G

POINT

ADJUST

MP

BLANK

WHITE B

POINT

ADJUST

OUTPUT

BUFFER

OUTPUT

BUFFER

g

CL

h

i HV

(H)

j

REGISTERS

DIGITAL ANALOG CONVERTERS

NMEN BLANK

FSBL HDTV

MP

MP

BLANK

BCOF

CUT-OFF

CONTROL

UGAP BCOF

OUTPUT

CLAMP

TIMING

GENERATOR

1st AND 2nd

SWITCH-ON

DELAY

LEAKAGE

CURRENT

COMPARATOR

17

UGAP

CL

330 nF

leakage storage

21

CB

220 nF

23

CG

220 nF

25

CR

220 nF

cut-off storage

24 RO

22 GO

RGB

outputs

to

video

amplifiers

20 BO

19 CI

leakage and

cut - off

current input

82 kΩ

MGE876

1997 Feb 06

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

5

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