TDA5950X Siemens Semiconductor, TDA5950X Datasheet - Page 5

• Manufacturer Part Number: TDA5950X
• Description: Video and Sound IF with FM-PLL Demodulator/ AFC and V & S SCART
• Manufacturer: Siemens Semiconductor

FS: 04/93
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
SIEMENS AG
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HL DOK
AUX/RF-Control
(Pin 4)
0
0
1
1
V66047-S679-C100-G2
Circuit Description
TDA 5950X
(Pin 17)
AV-off
0
1
0
1
(Pin 8 / Pin 19)
SCART
Output
muted
muted
IC-SPECIFICATION
IF
26.10.94
Page 4