TDA8124
MULTISTANDARD VIDEO IF INTERFACE
.
.
.
.
AUTOMATIC IDENTIFICATION OF PICTURE
CARRIER MODULATION POLARITY
VIDEO SIGNAL IDENTIFICATION (FOR
SOUND MUTING)
ANALOG AND DIGITAL A.F.C. FOR STOP
TUNING FUNCTION
PICTURE CARRIER DETECTION IN A
RANGE OF 1MHz AROUND THE IF-PICTURE
CARRIER VALUE
DESCRIPTION
The TDA8124 has been developed in order to
permit automatic standard switching and tuning
when coupled with a multistandard VIDEO IF IC
(for example TDA8120). It contains an A.F.C. syn-
chronous demodulator and an A.F.C. comparator,
a video polarity identification circuit with logic and
a video signal identification system.
PIN CONNECTIONS
DIP20
(Plastic Package)
ORDER CODE :
TDA8124
SUPPLY VOLTAGE
EXTERNAL PRESET
STOP-TUNING OUTPUT
UP/DOWN INPUT
A.F.C. OUTPUT
RESET F-F DELAY
NOT TO BE CONNECTED
IF TANK CIRCUIT
IF TANK CIRCUIT
GROUND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
P.C. POLARITY MODULATION OUTPUT
ENABLE
VIDEO IDENTIFICATION OUTPUT
PEAK DETECTOR CAPACITOR
BLACK LEVEL CAPACITOR
NOT TO BE CONNECTED
COMPOSITE VIDEO INPUT
RIPPLE DETECTOR
IF PICTURE CARRIER INPUT
IF PICTURE CARRIER INPUT
8124-01.EPS
October 1993
1/4
TDA8124
BLOCK DIAGRAM
AFC OUT
38.9
MHz
9
11
IF CARRIER
12
8
5
UP/DOWN
INPUT
4
STOP TUNING
OUTPUT
3
19 ENABLE
DEMODULATOR
COMPARATORS
2
R
EXTERNAL PRESET
13
VIDEO POLARITY
IDENTIFICATION
T
FLIP FLOP
D
VIDEO
20 POLARITY
OUTPUT
VIDEO
INPUT
14
VIDEO SIGNAL
IDENTIFICATION
TURNON
LATCHES
CLEAR
18
VIDEO
IDENTIFICATION
OUTPUT
6
1
V
CC
V
S
1
10
GND
16
17
* Pin s 3, 18, 20 : open collector
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
T
oper
T
stg
Parameter
Supply Voltage (Pin 1)
Operating Ambient Temperature Range
Storage Temperature Range
Value
15
0 to + 70
- 20 to + 150
Unit
V
o
C
o
C
THERMAL DATA
Max.
Max.
o
8124-02.TBL
8124-03.TBL
Symbol
R
th (j-a)
R
th (j-c)
Parameter
Junction-ambient Thermal Resistance
Junction-case Thermal Resistance
Value
80
14
Unit
C/W
o
C/W
ELECTRICAL CHARACTERISTICS
T
AMB
= 25
o
C, V
CC
= 12V (unless otherwise specified)
q
Positive video input signal V
i
= 3V
PP
with top sync level = 3V
q
Enable
≥
2V on Pin 19
Symbol
V
CC
I
S
Parameter
Supply Voltage
Supply Current
Video Input Top Sync Level
Video Input Top White Level
Composite Video Input Voltage
Ripple Voltage accross the
5.6nF External Capacitor
Pins
1
1
14
14
14
13
Test Conditions
Min.
10.8
14
Typ. Max.
12
13.2
24
32
3
6
1.5
C13 = 5.6nF
3
400
3.3
Unit
V
mA
V
V
V
PP
mV
q
q
q
q
B/G standard : M = 100%, D = 90%
L/E standard : M = 100%, R
≤
6%
B/G standard : M = 100%, D = 90%
L/E standard : M = 100%, R
≤
6%
2/4
8124-01.TBL
8124-02.EPS
TDA8124
ELECTRICAL CHARACTERISTICS
(continued)
T
AMB
= 25
o
C, V
CC
= 12V (unless otherwise specified)
q
Positive video input signal V
i
= 3V
PP
with top sync level = 3V
q
Enable
≥
2V
Symbol
Parameter
Pins
Peak Detector Threshold Voltage
17
Video Identification Current Capability 18
Minimum Sync Amplitude for Video
14
Identification
External Preset up/down and Enable
2, 4
Switch Voltages
19
External Preset, up/down, Enable
2, 4
Pins Input Impedance
19
Video Polarity Out Voltage
20
Test Conditions
Min. Typ. Max.
4.5
10
450
0
2
35
0.8
V
CC
50
Unit
V
mA
mV
PP
V
V
kΩ
Video Identification Out Voltage
IF Picture Carrier Input Voltage
A.F.C. Output Slope
V
11-12
DC Voltage
V8-9 DC Voltage
Stop/Tuning Output Voltage
Enable
≥
2V, P.C. IF = 38.9MHz
q
L/E (positive modulation)
q
B/G (negative modulation)
q
no video signal
18
q
with video signal
11, 12 P.C. IF = 38.9MHz
5
Q
LC
= 80, C
O
= 56pF,
L
O
≅
0.298µH, R
O
= 2.5kΩ
50
0.5
11, 12
8, 9
3
q
q
Stop/Tuning Output Bandwidth
3
1.1
1.3
1.5
MHz
TYPICAL APPLICATION
(with TDA8120)
L
o
= 0.298µH
C
o
= 56pF
R
o
2.5kΩ
9
8
4
3
19
MULTI
STANDARD
VIDEO
IF
TDA8120
12
13
5.6nF
VIDEO INPUT
STOP TUNING OUTPUT
ENABLE
EXTERNAL PRESET
VIDEO POLARITY OUTPUT
10µF
6
11
UP/DOWN
IF
INPUT
VIDEO
IF
FILTER
MULTISTANDARD
VIDEO IF
INTERFACE TDA8124
2
20
1
V
CC
14
16
17
470nF
VIDEO
IDENTIFICATION
OUTPUT
18
10
5
470nF
STANDARD SWITCH
680nF
* Pins 3, 18, 20 : open collector
Recommended load : about 5kΩ
3/4
8124-03.EPS
8124-04.TBL
No picture carrier or
39.4MHz < IF < 38.4MHz
With picture carrier
IF
PC
≥
38.9MHz
IF
PC
≤
39.4MHz
V
V
V
0.5
V
mV
PP
0.85
V
100kHz
3.8
V
3.65
V
V
0
V
CC
V
CC
V
S
V
0.5
TDA8124
PACKAGE MECHANICAL DATA
20 PINS - PLASTIC DIP
a1
I
b1
b
Z
e3
B
e
Z
L
E
D
20
11
F
1
10
Dimensions
a1
B
b
b1
D
E
e
e3
F
i
L
Z
Min.
0.254
1.39
Millimeters
Typ.
Max.
1.65
Min.
0.010
0.055
Inches
Typ.
Max.
0.065
0.45
0.25
25.4
8.5
2.54
22.86
7.1
3.93
3.3
1.34
0.018
0.010
1.000
0.335
0.100
0.900
0.280
0.155
0.130
0.053
DIP20.TBL
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
Purchase of I
2
C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
I C Patent. Rights to use these components in a I
2
C system, is granted provided that the system conforms to
the I
2
C Standard Specifications as defined by Philips.
2
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