TEA5031D ,COLOR TV VIDEO PROCESSORGENERAL DESCRIPTION
In order to ensure compatibility with standard video
transmission systems t ..
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TEA5031D
COLOR TV VIDEO PROCESSOR
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[WCRlC()DE:aE(CnT(iii(r()yN](C)e) TEA5031 D
COLOR TV VIDEO PROCESSOR
n MATRIXING OF R, G, B SIGNAL FROM (R-Y)
AND (B-Y)
n ELECTRONIC CONTROL OF CONTRAST,
BRIGHTNESS AND SATURATION
u THREE CHANNELS VIDEO SWITCH, FOR SE-
LECTION OF INTERNAL SIGNAL (broadcast)
OR EXTERNAL R, G, B INFORMATION (tele-
text, TV games, home computer)
a AUTOMATIC COLOR PICTURE TUBES CUT-
OFF ADJUSTMENT
TEA5031 D
DIP 28
(Plastic Package)
PIN CONNECTIONS
Ground B-Y input
Blue output fry input
Blue clamp Saturahon control
Blue feedback Voltage ref
Green output VCC
Green clamp Ground
Green feedback Vadeo Input
DESCRIPTION
The TEA5031 D is a color TV video processor com-
patible with all standards PAL/SECAM/NTSC and
new needs such as teletext, Antiope, TV games,
remote control etc...
December1988
Red output
Red clamp
Red feedback
Fast blank
Blue O.S.D. input
Red O.S.D. input
Green O.S.D. input
inverse video output
Video delayed input
Contrast control
Y clamp
Bnghtness control
Frame retrace
Sand Castle
E88TEA5031D-02
TEA5031D
BLOCK DiAGRAM
Svnc. separation - -1/'0--- Daiay line
Video output '
V Delayed video
....3 PP input Y
Video input
o/1,./i,
Brightness controi
Contrast control
Saturation control
(R-Y) IB-Y)
Clamp Y
Sand castle pulse Frame retrace
Fast blank
internal On screen display inputs
CC vet. G g n
24 26 It 13
",', F
OUTPUT a F"
MATRIX STAGE
7 Gran
E88TEA5031D-01
GENERAL DESCRIPTION
In order to ensure compatibility with standard video
transmission systems the luma input is a high im-
pedance, AC coupled, designed to accept a 1V
video signal. After a X3 gain voltage amplifier the in-
verted luma signal is brought out to the luma delay
line. This output is low impedance to match the delay
accurately.
Following the luma delay line the video is controlled
by an electronic gain control with a range of 40dB.
The DC luma level is locked on the black level (out-
off current) with a range of i IV depending of bright-
ness. The DC voltage level is clamped during each
line retrace and an external capacitor holds this vol-
tage during the line trace.
After brightness and contrasts controls the Iumin-
ance is fed to the matrix with R-Y and B-Y signals.
The R-Y and B-Y inputs are high impedance with
AC coupling, compatible with decoder I'Cs such as
the TEA5630 tor SECAM and the TEA5620forPAL,
The voltage gain of R-Y and B-Y is controlled by
saturation. The saturation is in tracking with contrast
and then the R-Y and B-Y signals are fed to the ma-
trix and summed with on-screen display signals
which are controlled in gain by the luma contrast
control. Each input is AC coupled and black level
2/7 gr, scs-momsom
clamped using the coupling capacitor as the storage
element for the clamp voltage.
All the controls have an active range of 0.5 to 4.5 V
making them compatible with D/A converter derived
control signals, such as those from remote control
systems. The three on-chip output stages are high
gain class B amplifiers with the gain set by parallel
feedback resistor.
This gives a well defined gain and stable output vol-
tage level. The beam current in each cathode of the
picture tube is monitored by a high-voltage PNP
transistor or the TEA5101 A video amplifier. A
sample of this current is fed back to the IC.
In the iuma signal a reference black level is inserted
during the line and frame blanking periods. While
this reference level is present, and after the frame
flyback, the output stage feedback input goes high
impedance and an internal comparator is actived.
This circuit compares an internal reference voltage
(2V typ) to the voltage developed across an exter-
nal resistor by the picture tube beam current, and
the output voltage is trimmed to get the desired ca-
thode current value.
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