TDA4884 datasheet(13/28 Pages) PHILIPS

13 / 28 page

1997 Nov 26

Philips Semiconductors

Product speciﬁcation

Three gain control video pre-ampliﬁer for OSD

TDA4884

Fig.4 Signal processing.

handbook, full pagewidth

MHA920

video portion

black level equal to

artificial black level

+ VBE

by input clamping (approximately 3 V)

input clamping pulse

at pin 10

internal signal

behind input stage

input signals

output signals

(pins 19, 16 and 13)

sync clipping to

artificial black level

horizontal blanking and

output clamping pulse

at pin 9

horizontal flyback and output clamping

black level equal to artificial

black level by input clamping and

storage by coupling capacitor

video signal

inserted artificial black level

signal at CRT cathode

at nominal gain and

maximum brightness setting

and

maximum/nominal/

minimum contrast setting

at nominal gain and

contrast setting

(brightness setting as well as

horizontal blanking via grid 1)

at nominal contrast and

maximum/nominal/

minimum gain setting

black level

ground

ultra black level

reference black level

high tension supply

voltage (e.g. 90 V)

nom

max

min

nom

max

min

input signal at

pins 2, 5 and 8

with sync (on green)

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