November 1987
2
Philips Semiconductors
Product specification
Video control combination circuit with
automatic cut-off control
TDA3505
TDA3506
GENERAL DESCRIPTION
The TDA3505 and TDA3506 are monolithic integrated circuits which perform video control functions in a PAL/SECAM
decoder. The TDA3505 is for negative colour difference signals
-
(R-Y),
-
(B-Y) and the TDA3506 is for positive colour
difference signals
+
(R-Y),
+
(B-Y).
The required input signals are: luminance and colour difference (negative or positive) and a 3-level sandcastle pulse for
control purposes. Linear RGB signals can be inserted from an external source. RGB output signals are available for
driving the video output stages. The circuits provide automatic cut-off control of the picture tube.
Features
Capacitive coupling of the colour difference and
luminance input signals with black level clamping in the
input stages
Linear saturation control acting on the colour difference
signals
(G-Y) and RGB matrix
Linear transmission of inserted signals
Equal black levels for inserted and matrixed signals
3 identical channels for the RGB signals
Linear contrast and brightness controls, operating on
both the inserted and matrixed RGB signals
Peak beam current limiting input
Clamping, horizontal and vertical blanking of the three
input signals controlled by a 3-level sandcastle pulse
3 DC gain controls for the RGB output signals (white
point adjustment)
Emitter-follower outputs for driving the RGB output
stages
Input for automatic cut-off control with compensation for
leakage current of the picture tube
QUICK REFERENCE DATA
PACKAGE OUTLINE
28-lead DIL; plastic (SOT117); SOT117-1; 1996 November 20.
PARAMETER
CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Supply voltage (pin 6)
V
P
=
V
6-24
-
12
-
V
Supply current
I
P
= I
6
-
95
-
mA
Composite video input
signal (peak-to-peak value)
V
15-24(p-p)
-
0,45
-
V
Colour difference input
signals (peak-to-peak value)
-
(B-Y) or
+
(B-Y) respectively
V
18-24(p-p)
-
1,33
-
V
-
(R-Y) or
+
(R-Y) respectively
V
17-24(p-p)
-
1,05
-
V
Inserted RGB signals
V
(black-to-white value)
V
12,13,14-24
-
1,0
-
V
Three-level sandcastle pulse
V
10-24
-
2,5
-
V
-
4,5
-
V
-
8,0
-
V
Control voltage ranges
brightness
V
20-24
1,0
-
3,0
V
contrast
V
19-24
2,0
-
4,3
V
saturation
V
16-24
2,0
-
4,3
V
November 1987
3
Philips Semiconductors
Product specification
Video control combination circuit with
automatic cut-off control
TDA3505
TDA3506
Fig.1 Part of block diagram; continued in Fig. 2
Note
Colour difference inputs are negative for TDA3505 or positive for TDA3506.
November 1987
5
Philips Semiconductors
Product specification
Video control combination circuit with
automatic cut-off control
TDA3505
TDA3506
PINNING
PIN
DESCRIPTION
1
red output
2
green storage capacitor for cut-off control
3
green output
4
blue storage capacitor for cut-off control
5
blue output
6
positive supply voltage (
+
12 V)
7
blue storage for brightness
8
green storage for brightness
9
red storage for brightness
10
sandcastle pulse input
11
fast switch for RGB inputs
12
blue input (external signal)
13
green input (external signal)
14
red input (external signal)
15
luminance input
16
saturation control input
17
colour difference input
-
(R-Y) or
+
(R-Y) respectively
18
colour difference input
-
(B-Y) or
+
(B-Y) respectively
19
contrast control input
20
brightness control input
21
white point adjustment, blue
22
white point adjustment, green
23
white point adjustment, red
24
ground (0 V)
25
control input for peak beam current limiting
26
automatic cut-off control input
27
storage capacitor for leakage current
28
red storage capacitor for cut-off control
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