TDA5950X Siemens Semiconductor, TDA5950X Datasheet - Page 9

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

TDA 5950X
Alignment Instructions
At a video carrier input level of
V
= 4 mVrms,
f
= 38.9 MHz, and a superimposed AGC
23/24
P/C
V
voltage of
= 1.5 V, the demodulator tank circuit is preliminarily aligned until a max. video signal
3
14 Vpp is obtained at the video output. Any suitable video test signal can be used for modulation.
V
The AGC voltage
is reduced until the signal is approx. 1 Vpp and the max. video signal is
3
obtained when fine-aligning the demodulator tank circuit. The alignment is not critical due to
relatively large bandwidth of the demodulator tank circuit. Fine-tuning to intercarrier
S
/
N
, differential
phase or 2T-pulse characteristics is possible.
Test Circuit
Semiconductor Group
9