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SL5067DPAS 데이터시트(PDF) 4 Page - General Electric Company |
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SL5067DPAS 데이터시트(HTML) 4 Page - General Electric Company |
4 / 13 page SL5067 4 VIDEO The video signal is applied to pin 4 via a coupling capacitor, (see Fig.9). This capacitor provides both clamping and black level hold. The internal peak white AGC can cope with an input signal of between 0.5 and 1.5 volts peak to peak.The full 9.5 dB AGC range is handled within a 600mV span on this storage capacitor. Pin 3 (MOD INDEX) is used to control both RF carrier amplitude and video polarity, see Fig. 3. Since the video input is internally AGC’d, varying the carrier amplitude will also adjust the video modulation index, see Fig. 4. For example, for a negative modulation (PAL or NTSC) with an 80% modulation index, pin 3 should be set to 1.1Volts (see Fig. 4). This voltage corresponds to an unmodulated RF output level of 82dB mV, see Fig. 3. AUDIO The sound IF oscillator can operate from 4.5MHz to 6.5MHz to cover all sound standards. The centre frequency is determined by the Sound IF Tank LC connected between pins 15 and 16. The centre frequency is given by. f 0 + 1 2 p LC The Q factor of the TANK is given by. Q + 1770 2 pf 0L + 1770 2 pf 0C The Q factor of the coil must be high, e.g. >20 Good temperature stability can be achieved by the correct choice of temperature coefficients for Csound and Lsound. The Audio signal should be coupled into pin 17 via a 470nF capacitor. The maximum input level is 1 volts peak to peak. Selection of AM or FM sound is made via pin 18 (FMAMSEL). The DC value on this pin controls the level of the sound subcarrier. The crossover point between FM and AM sound occurs at ½VCC (measured at pin 18). Below this voltage, the modulator is set to FM sound; above it to AM. Graphs for AM and FM sound subcarrier output levels are shown in Figs. 6 and 7. If AM sound is required, it is recommended that a modulated carrier is fed into the Audio input. Further details of this are mentioned at the end of the datasheet in the paragraph marked ‘‘Positive Modulation” MODULATED RF OUTPUT The modulated RF outputs from pin 1 and pin 2 consist of open collectors which should be externally connected to VCC via 75 W resistors. Great care must be taken with the decoupling of the supply to these outputs. Both outputs are suitable for driving either 75 W line, or for connection to a balun or impedance matching transformer. This has the added benefit of minimising common mode coupling, thus giving improved RF performance. 87 85 83 81 79 0.0 1.0 2.0 3.0 4.0 5.0 80dB mV 1.4 2.45 VOLTAGE SET ON PIN 3 Fig. 4. Picture carrier, unmodulated RF output level 77 |
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