Q67000-A5144 데이터 시트보기 (PDF) - Siemens AG

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Q67000-A5144

Video and Sound IF with V & S SCART

Siemens AG 

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

THDAFo

Max. SCART-input voltage

V7RMS

Gain SCART-sound switch

G7-6

1

µV

mV ∆f = 30 kHz

fmod = 1 kHz

FSIF = 5.5 MHz

mV ∆f = 30 kHz

fmod = 1 kHz

FSIF = 5.5 MHz

0.5

% ∆f = 30 kHz

fmod = 1 kHz

FSIF = 5.5 MHz

2

V

V8 ≥ 3.6 V

Alignment Instructions

At a video carrier input level of V1/2 = 4 mVrms, fPC = 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 V11pp 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

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