TDA5930-5 Datasheet, PDF (10/18 Pages) Siemens Semiconductor Group – Video IF Amplifier and Demodulator

TDA 5930-5
Characteristics (cont’d)
T_A = 25 ˚C
Parameter
Symbol
Limit Values
Unit Test Condition
min. typ. max.
Design Notes (no 100 % final test) (cont’d)
Temperature drift of the tuner
AGC threshold referred to the
input voltage
Ratio pulse bar tilt
to sync. amplitude
Reaction time of white level
peak setting, L standard
2
dB I₅ = I_5max/2
caused by the
self-heating of the
ICs 10 s to 15 min.
4
%
10
µs low-pass filter in
regulation slope
ca. 300 kHz
Alignment Instructions
At a video carrier input level of V_1/16 = 4 mVrms, f_PC = 38.9 MHz, and a superimposed AGC voltage
of V₄ = 1.5 V, the demodulator tank circuit is preliminarily aligned until a max. video signal V_11pp is
obtained at the positive video output. Any suitable video test signal can be used for modulation. The
AGC voltage V₄ is reduced until the signal is approx. 3 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.
Semiconductor Group
22