TDA4443 Datasheet, PDF (2/7 Pages) STMicroelectronics – MULTISTANDARD VIDEO IF AMPLIFIER

TDA4443
BLOCK DIAGRAM
VIDEO
OUTPUT
TDA4443
11
10
WIDE BAND AMPLIFIER
DEMODULATOR
IF INPUT
16
IW
9
IF INPUT
1
VIDEO
8
CONTROL
AMPLIFIER
3
15
STANDARD
SWITCH
V_S
TUNER
CONTROL
SUPPLY
UNIT
GATING
AMPLIFIER
7
GATING
PULSE
2
4
5
TUNER
AGC
OUTPUT
6
13
TUNER
AGC
ADJUST
V_CC
GENERAL DESCRIPTION
.^{This video IF processing circuit integrates the fol-}
lowing functional blocks :
Three symmetrical, very stable, gain controlled
.. wideband amplifier stages - without feedback
by a quasi-galvanic coupling.
Demodulator controlled by the picture carrier
Video output amplifier with high supply voltage
...... rejection
Polarity switch for the video output signal
AGC on peak white level
Gated AGC
Discharge control
Delayed tuner AGC
At VTR Reading mode the video output signal
is at ultra white level
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