TDA5940-2 Datasheet, PDF (7/9 Pages) Siemens Semiconductor Group – Video and Sound IF with V & S SCART

TDA 5940-2
Characteristics (cont’d)
Parameter
Symbol
Limit Values
min. typ. max.
Unit Test Condition
Sound IF Section
Min. sound IF-input voltage
V₉
(min. control)
AF-output voltage
V₆
70
500
SCART AF-output voltage
V₅
500
Total harmonic distortion
THD_AFo
Max. SCART-input voltage
V_7RMS
Gain SCART-sound switch
G_7-6
1
µV
mV ∆f = 30 kHz
f_mod = 1 kHz
F_SIF = 5.5 MHz
mV ∆f = 30 kHz
f_mod = 1 kHz
F_SIF = 5.5 MHz
0.5
% ∆f = 30 kHz
f_mod = 1 kHz
F_SIF = 5.5 MHz
2
V
V₈ ≥ 3.6 V
Alignment Instructions
At a video carrier input level of V_1/2 = 4 mVrms, f_PC = 38.9 MHz, and a superimposed AGC voltage
of V₂₂ = 1.5 V, the demodulator tank circuit is preliminarily aligned until a max. video signal V_11pp is
obtained at the video output. Any suitable video test signal can be used for modulation. The AGC
voltage V₂₂ 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.
Semiconductor Group
50