전자부품 데이터시트 검색엔진 |
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TDA5940-2 데이터시트(PDF) 7 Page - Siemens Semiconductor Group |
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TDA5940-2 데이터시트(HTML) 7 Page - Siemens Semiconductor Group |
7 / 9 page Semiconductor Group 50 TDA 5940-2 Characteristics (cont’d) 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. Parameter Symbol Limit Values Unit Test Condition min. typ. max. Sound IF Section Min. sound IF-input voltage (min. control) V9 70 µV AF-output voltage V6 500 mV ∆f = 30 kHz fmod = 1 kHz FSIF = 5.5 MHz SCART AF-output voltage V5 500 mV ∆f = 30 kHz fmod = 1 kHz FSIF = 5.5 MHz Total harmonic distortion THDAFo 0.5 % ∆f = 30 kHz fmod = 1 kHz FSIF = 5.5 MHz Max. SCART-input voltage V7RMS 2V Gain SCART-sound switch G7-6 1 V8 ≥ 3.6 V |
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