Video and Sound IF with FM-PLL
Demodulator, AFC and V & S SCART
TDA 5950X
Bipolar IC
Features
q
q
q
q
Features video and sound IF
Video and sound SCART
AFC
NTSC option
P-DSO-24-1
Type
TDA 5950X
TDA 5950X
Functional Description
Video IF Section
Ordering Code
Q67000-A5112
Q67007-A5112
Package
P-DSO-24-1 (SMD)
P-DSO-24-1 Tape and Reel dry
Video IF-broadband amplifier followed by a quasi-synchronous demodulator for negative
modulated IF signals. A video switch interface is included in the video section. A separate video
output after the demodulator permits the installation of one or more sound traps at the input of the
video switch. The tuner AGC threshold is set by means of a potentiometer, all other functions can
switched with open collector transistors.
Sound IF Section
FM-IF limiter with FM-PLL demodulator for the frequency range of 5.5 MHz to 6.5 MHz. The AF
section includes an audio switch followed by an audio buffer output.
Application
The TDA 5950X is suitable for application in television receivers or video tape recorders with A/V
switches.
Semiconductor Group
1
12.94
TDA 5950X
Circuit Description
Video IF Section
The video IF section incorporates a four-stage, capacitively coupled, symmetrical and controlled
amplifier, a limiter with selection and a mixer for quasi-synchronous demodulation of negative
modulated IF signals followed by a video output amplifier. The video demodulator output and the
video switch input are connected by means of a sound trap. The video switch has two inputs (for
signals from video demodulator and from external source) and two outputs. Parallel to the video
output amplifier the video signal is used for generating the AGC voltage. The control circuit is
designed on the integralaction AGC principle, employing a noise-free peak value detector. A
delayed tuner AGC voltage with positive control direction is derived from the AGC voltage via a
threshold amplifier that is set by means of an external potentiometer. An AFC push pull output
current is generated from picture carrier tank circuit.
Sound IF Section
The sound IF section incorporates a five-stage, symmetrical limiter amplifier followed by a PLL
demodulator. The AF section contains an audio switch followed by an output buffer.
Switch Matrix
AUX/RF-Control
(Pin 4)
0
0
1
1
AV-OFF
(Pin 17)
0
1
0
1
Output
(Pin 8 / Pin 19)
muted
IF
muted
SCART
Semiconductor Group
2
TDA 5950X
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Function
Delayed tuner AGC output
Delayed tuner AGC threshold
AGC-time constant
Aux / RF control
Ground
+
V
S
supply voltage
Auxiliary video output
Video output
Auxiliary video input
AFC output
Demodulator tank circuit
Demodulator tank circuit
Video input at sound trap output
Video demodulator output
Sound IF ground
Sound IF input
A / V OFF
Auxiliary audio input
Audio output
Auxiliary audio output
De-emphasis capacitor
Low-pass capacitor
Video IF input
Video IF input
Semiconductor Group
3
TDA 5950X
Block Diagram
Semiconductor Group
4
TDA 5950X
Absolute Maximum Ratings
T
A
= 0 to 70 ˚C
Parameter
Supply voltage
Junction temperature
Storage temperature
Thermal resistance
Operating Range
Supply voltage
Supply voltage delayed tuner AGC
Ambient temperature during operation
Input frequency range
Symbol
min.
Limit Values
max.
8
150
125
70
V
˚C
˚C
K/W
0
0
– 40
Unit
V
6
T
j
T
stg
R
th JA
V
6
V
1
T
A
f
IF
4.5
1
0
12
8
13.2
70
80
V
V
˚C
MHz
Semiconductor Group
5
FPGA/CPLD
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
