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TDA4470 Datasheet(PDF) 4 Page - TEMIC Semiconductors |
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TDA4470 Datasheet(HTML) 4 Page - TEMIC Semiconductors |
4 / 16 page TDA4470-M TELEFUNKEN Semiconductors Rev. A2, 15-Oct-96 Preliminary Information 4 (16) Standard Switch To have equal polarity of the video output signal the polarity can be switched in the demodulation stage in accordance with the TV standard. Additional a standard dependent dc level shift in the video amplifier delivers the same sync. level. In parallel to this, the correct VIF-AGC is selected for positive or negative modulated VIF signals. In the case of negative modulation (e.g., B/G standard) the AM output signal is switched off. For positive modu- lation (L standard) the AM demodulator and QPS mixer is active. This condition allows a parallel operation of the AM sound signal and the NICAM-L stereo sound. L’ Switch With a control voltage at Pin 14 the VCO frequency can be switched for setting to the required L’ value (L’ standard). Also a fine adjustment of the L’-VCO center frequency is possible via a potentiometer. The L’ switch is only active for positive modulated video IF-signals (standard switch in L mode). AFC Switch The AFC output signal at Pin 22 can be controlled by a switching voltage at Pin 19. It is possible to select an AFC output signal with a rising- or falling AFC curve and to switch off the AFC. VCR Mode For the VCR mode in a TV set (external video source selected), it is recommendable to switch off the IF circuit. With an external switching voltage at Pin 6 or 7, the IF amplifiers are switched off and all signal output levels at Pins 12, 24, and 25 are according to the internal dc voltage. Internal Voltage Stabilizer The internal bandgap reference ensures constant perfor- mance independent of supply voltage and temperature. |
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