TDA5950X Datasheet, PDF (9/11 Pages) Siemens Semiconductor Group – Video and Sound IF with FM-PLL Demodulator, AFC and V & S SCART

TDA 5950X
Alignment Instructions
At a video carrier input level of V_23/24 = 4 mVrms, f_P/C = 38.9 MHz, and a superimposed AGC
voltage of V₃ = 1.5 V, the demodulator tank circuit is preliminarily aligned until a max. video signal
14 Vpp is obtained at the video output. Any suitable video test signal can be used for modulation.
The AGC voltage V₃ is reduced until the signal is approx. 1 Vpp and the max. video signal is
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