Video control combination circuit
with automatic cut-off control
Product specification
Supersedes data of April 1993
File under Integrated Circuits, IC02
1996 Oct 25
Page 2
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
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
• Three 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
• Three 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.
TDA3508
GENERAL DESCRIPTION
The TDA3508 is an integrated circuit which performs video
control functions in a PAL/SECAM decoder for negative
colour difference signals −(R−Y) and −(B−Y).
The required input signals are luminance and colour
difference 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 circuit provides
automatic cut-off control of the picture tube.
(pins 12, 13 and 14)
3-level sandcastle pulse (pin 10)
level 1−2.5−V
level 2−4.5−V
level 3−8.0−V
control voltage for brightness (pin 20)1.0−3.0V
control voltage for contrast (pin 19)2.0−4.3V
control voltage for saturation (pin 16)2.0−4.3V
operating ambient temperature0−70°C
1996 Oct 253
Page 4
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
BLOCK DIAGRAM
green
CONTROL
CONTROL
BRIGHTNESS
BRIGHTNESS
CONTROL
CONTRAST
(b-w)
879
13 1214
red
CONTROL
BRIGHTNESS
CONTROL
CONTRAST
blue
CONTROL
BRIGHTNESS
CONTROL
CONTRAST
clamping pulse
4.5 V
SOURCE
CURRENT
TRESHOLD
DETECTOR
TDA3508
control
voltage
brightness
1920
contrast control
voltage (2 to 4.3 V)
25
control input
for peak beam
current limiting
(1 to 3 V)
signal insertion 1 V
3 x SIGNAL SWITCH
R
MATRIX
(R−Y)
CONTROL
SATURATION
17CLAMPING
11
SIGNAL
SWITCHES
DRIVER FOR
(1 V)
G
Y
(G−Y)
4.4 V
MATRIX
(G−Y)
MATRIX
Y
B
MATRIX
(B−Y)
CONTROL
SATURATION
18
CLAMPING
Y
clamping pulse
CLAMPING
15
Y
AMPLIFIER
10 dB
(part A)
TDA3508
246
16
2.9 V
input for signal
switching voltage
P
V
(+12 V)
saturation
(2 to 4.3 V)
control voltage
MSA736
handbook, full pagewidth
Fig.1 Block diagram (continued in Fig.2).
−(R−Y)
(1.05 Vp-p)
1996 Oct 254
−(B−Y)
(1.33 Vp-p)
composite
video
signal
(0.45 Vp-p)
Page 5
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
storage capacitors
for cut-off
control
2428
red
1
CONTROLLED
OUTPUT
STAGE
2 V B/W
CONTROLLED
OUTPUT
STAGE
2 V B/W
green
3
5 blue
CONTROLLED
OUTPUT
STAGE
2 V B/W
RGB
control current
(3x)
TDA3508
MSA737
L
input for
voltage derived
from leakage
current of R
and cut-off
currents
(R or G or B)
26
+
(part B)
TDA3508
22 2123
(0 to 12 V)
white point adjustment
CONTROL
AMPLIFIER
INSERTION
PULSE
CURRENT
OF BLACK
MEASURING
BLANKING
red
&
V/I
CONVERTER
COMPARATOR
MR
CONTROL
AMPLIFIER
OF BLACK
INSERTION
PULSE
CURRENT
MEASURING
BLANKING
green
&
V/I
CONVERTER
COMPARATOR
MG
CONTROL
AMPLIFIER
OF BLACK
INSERTION
PULSE
CURRENT
MEASURING
BLANKING
blue
&
V/I
CONVERTER
COMPARATOR
MB
line 21 (1)
line 22 (1)
line 23 (1)
H + V
clamping
pulse
CIRCUIT
CLAMPING
SWITCHING AND
clamping
lines 21 to 23 (1)
lines 21 (1)
&
PULSE
FORMER
COUNTER
H + V
H
DETECTOR
SANDCASTLE
pulse
storage of leakage
current information
2.5 V
4.5 V
0
8 V
1027
sandcastle
pulse
handbook, full pagewidth
Fig.2 Block diagram (continued from Fig.1).
1996 Oct 255
(1) After start of vertical blanking pulse.
Page 6
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
PINNING
SYMBOLPINDESCRIPTION
RO1red output
CGC2green storage capacitor for cut-off
control
GO3green output
CBC4blue storage capacitor for cut-off
control
BO5blue output
V
P
CB7blue storage capacitor for
CG8green storage capacitor for
CR9red storage capacitor for brightness
SC10sandcastle pulse input
FSW11fast switch for RGB inputs
BI12blue input (external signal)
GI13green input (external signal)
RI14red input (external signal)
Y15luminance input
SAT16saturation control input
−(R−Y)17colour difference input
−(B−Y)18colour difference input
CON19contrast control input
BRI20brightness control input
WPB21white point adjustment input; blue
WPG22white point adjustment input; green
WPR23white point adjustment input; red
GND24ground (0 V)
PBL25control input for peak beam current
ACO26automatic cut-off control input
CSL27storage capacitor for leakage
CRC28red storage capacitor for cut-off
6supply voltage (+12 V)
brightness
brightness
limiting
current
control
handbook, halfpage
1
RO
2
CGC
3
GO
4
CBC
BO
5
V
6
P
CB
7
CG
CR
SC
FSW
BI
GI
RI
TDA3508
8
9
10
11
12
13
MSA738
Fig.3 Pin configuration.
TDA3508
CRC
28
CSL
27
ACO
26
PBL
25
GND
24
WPR
23
22
WPG
21
WPB
BRI
20
CON
19
(B Y)
18
(R Y)
17
SAT
16
1514
Y
1996 Oct 256
Page 7
Philips SemiconductorsProduct specification
Video control combination circuit with
TDA3508
automatic cut-off control
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOLPARAMETERCONDITIONSMIN.MAX.UNIT
V
P
V
n
V
11
V
16,19,20
V
n1
I
1,3,5
I
19
I
20
I
25
P
tot
T
amb
T
stg
V
es
supply voltage on pin 6013.2V
input voltage on pins 10, 21, 22, 23, 25 and 260V
P
V
input voltage on pin 11−0.5+3.0V
input voltage on pins 16, 19 and 2000.5V
voltage on pins 1 to 5, 7 to 9, 12 to 15, 17, 18,
27 and 28
no external DC voltage
V
P
V
output current on pins 1, 3 and 5−−3mA
input current on pin 19−10mA
input current on pin 20−5mA
input current on pin 25−5−mA
total power dissipation−1.7W
operating ambient temperature070°C
storage temperature−25+150°C
electrostatic handling voltage;
pin 10note 1−500+450V
all other pinsnote 1−500+500V
Note
1. Equivalent to discharging a 200 pF capacitor via a 0 Ω series resistor.
1996 Oct 257
Page 8
Philips SemiconductorsProduct specification
Video control combination circuit with
TDA3508
automatic cut-off control
CHARACTERISTICS
V
= 12 V; V
P
12,13,14(p-p)
application circuit of Fig.4; nominal settings of brightness, contrast, saturation and white point adjustment; all voltages
referenced to ground (pin 24); unless otherwise specified.
Automatic cut-off control (pin 26); notes 2, 6, 7, 8 and 9
V
26
V
26
Gain data (at nominal brightness, contrast, saturation and white point settings)
G
v1,3,5-15
α
1,3,5-15
G
v
αfrequency response of colour
G
v
αfrequency response of inserted
t
r
t
f
∆t
1,3,5
t
d
∆G
v1,3,5
output voltageblack-to-white positive1.52.02.5V
black level without automatic cut-off
V
= 10 V; note 26.16.97.7V
28,2,4
control
difference in black level between
−−10mV
RGB channels due to variation of
contrast control
cut-off control rangenote 24.04.6−V
input voltage0−6.5V
voltage difference between cut-off
0.50.640.72V
current measurement and leakage
current measurement
voltage gain with respect to
141618dB
luminance input (pin 15)
frequency response of luminance
fi=0to5MHz−−3dB
path
voltage gain with respect to colour
369dB
difference inputs
(pins 1 to 17 and 5 to 18)
f
=0to2MHz−−3dB
i
difference paths
(pins 1 to 17 and 5 to 18)
voltage gain with respect to inserted
468dB
signals (pins 1 to 14, 3 to 13
and 5 to 12)
f
=0to10MHz−−3dB
i
signal paths (pins 1 to 14, 3 to 13
and 5 to 12)
rise time of RGB output signals
−40−ns
(pins 1, 3 and 5)
fall time of RGB output signals
−40−ns
(pins 1, 3 and 5)
difference in transition times
−015ns
between R, G and B channels
delay time between signal switching
−25−+25ns
and signal insertion
difference in gain between normal
−−10%
and signal insertion mode
1996 Oct 2510
Page 11
Philips SemiconductorsProduct specification
Video control combination circuit with
TDA3508
automatic cut-off control
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
Sandcastle pulse detector (pin 10)
V
10
the following amplitudes are
required for separating the various
pulses
I
10
input current−−−110µA
Notes
1. Maximum value <110 mA after warm-up.
2. Values are proportional to the supply voltage.
3. Matrixed according to equation V
4. When V
< 0.4 V during clamping time, the black levels of the inserted RGB signals are clamped on the black
11-24
levels of the internal RGB signals. When V
(G−Y)
= −0.51V
11-24
signals are clamped on an internal DC voltage (correct clamping of the external RGB signals is possible only when
they are synchronous with the sandcastle pulse).
5. When pins 21, 22 and 23 are not connected, an internal bias voltage of 5.5 V is supplied.
6. Automatic cut-off control measurement occurs in the following lines after start of the vertical blanking pulse:
a) line 20: measurement of leakage current (R + G + B).
b) line 21: measurement of red cut-off current.
c) line 22: measurement of green cut-off current.
d) line 23: measurement of blue cut-off current.
7. Black level of the measured channel is nominal; the other two channels are blanked to ultra-black.
8. All three channels blanked to ultra-black. The cut-off control cycle occurs when the vertical blanking part of the
sandcastle pulse contains more than 3 line pulses. The internal blanking continues until the end of the last measured
line. The vertical blanking pulse is not allowed to contain more than 34 line pulses, otherwise another control cycle
begins.
9. Input pin 26 switches to ground during horizontal flyback.
10. The sandcastle pulse is compared with three internal thresholds (proportional to VP) and the given levels separate
the various pulses.
11. Blanked to ultra-black (−25%).
12. Pulse duration ≥3.5 µs.
horizontal and vertical
1.01.52.0V
blanking; notes 10 and 11
required pulses (H + V);
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
A
A
UNIT
inches
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
max.
mm
12
min.
max.
b
1.7
1.3
0.066
0.051
b
0.53
0.38
0.020
0.014
cD EweM
1
0.32
0.23
0.013
0.009
(1)(1)
36.0
35.0
1.41
1.34
14.1
13.7
0.56
0.54
E
14
(1)
L
3.9
3.4
M
E
15.80
15.24
0.62
0.60
H
17.15
15.90
0.68
0.63
0.252.5415.24
0.010.100.60
e
1
0.15
0.13
Z
max.
1.75.10.514.0
0.0670.200.0200.16
OUTLINE
VERSION
SOT117-1
IEC JEDEC EIAJ
051G05MO-015AH
REFERENCES
1996 Oct 2513
EUROPEAN
PROJECTION
ISSUE DATE
92-11-17
95-01-14
Page 14
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
“IC Package Databook”
Soldering by dipping or by wave
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
(order code 9398 652 90011).
TDA3508
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
Repairing soldered joints
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
stg max
). If the
DEFINITIONS
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data sheet contains preliminary data; supplementary data may be published later.
Product specificationThis data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
1996 Oct 2514
Page 15
Philips SemiconductorsProduct specification
Video control combination circuit with
automatic cut-off control
NOTES
TDA3508
1996 Oct 2515
Page 16
Philips Semiconductors – a worldwide company
Argentina: see South America
Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,
United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. +1 800 234 7381
Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,
Tel. +381 11 625 344, Fax.+381 11 635 777
For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Internet: http://www.semiconductors.philips.com
Printed in The Netherlands537021/1200/02/pp16 Date of release: 1996 Oct 25Document order number: 9397 750 00968
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