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TDA3561A датащи(PDF) 11 Page - NXP Semiconductors |
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TDA3561A датащи(HTML) 11 Page - NXP Semiconductors |
11 / 14 page September 1982 11 Philips Semiconductors Product specification PAL decoder TDA3561A APPLICATION INFORMATION The function is described against the corresponding pin number. 1. + 12 V power supply The circuit gives good operation in a supply voltage range between 8 and 13,2 V provided that the supply voltage for the controls is equal to the supply voltage for the TDA3561A. All signal and control levels have a linear dependency on the supply voltage. The current taken by the device at 12 V is typically 85 mA. It is linearly dependent on the supply voltage. 2. Control voltage for identification This pin requires a detection capacitor of about 330 nF for correct operation. The voltages available under various signal conditions are given in the specification. 3. Chrominance input The chroma signal must be a.c.-coupled to the input. Its amplitude must be between 55 mV and 1100 mV peak-to-peak (25 mV to 500 mV peak-to-peak burst signal). All figures for the chroma signals are based on a colour bar signal with 75% saturation, that is the burst-to-chroma ratio of the input signal is 1 : 2,25. 4. Reference voltage A.C.C. detector This pin must be decoupled by a capacitor of about 330 nF. The voltage at this pin is 4,9 V. 5. Control voltage A.C.C. The A.C.C. is obtained by synchronous detection of the burst signal followed by a peak detector. A good noise immunity is obtained in this way and an increase of the colour for weak input signals is prevented. The recommended capacitor value at this pin is 2,2 µF. 6. Saturation control The saturation control range is in excess of 50 dB. The control voltage range is 2 to 4 V. Saturation control is a linear function of the control voltage. When the colour killer is active, the saturation control voltage is reduced to a low level if the resistance of the external saturation control network is sufficiently high. Then the chroma amplifier supplies no signal to the demodulator. Colour switch-on can be delayed by proper choice of the time constant for the saturation control setting circuit. When the saturation control pin is connected to the power supply the colour killer circuit is overruled so that the colour signal is visible on the screen. In this way it is possible to adjust the oscillator frequency without using a frequency counter (see also pins 25 and 26). 7. Contrast control The contrast control range is 20 dB for a control voltage change from + 2 to + 4 V. Contrast control is a linear function of the control voltage. The output signal is suppressed when the control voltage is 1 V or less. If one or more output signals surpasses the level of 9 V the peak white limiter circuit becomes active and reduces the output signals via the contrast control by discharging C2 via an internal current sink. 8. Sandcastle and field blanking input The output signals are blanked if the amplitude of the input pulse is between 2 and 6,5 V. The burst gate and clamping circuits are activated if the input pulse exceeds a level of 7,5 V. The higher part of the sandcastle pulse should start just after the sync pulse to prevent clamping of video signal on the sync pulse. The width should be about 4 µs for proper A.C.C. operation. 9. Video-data switching The insertion circuit is activated by means of this input by an input pulse between 1 V and 2 V. In that condition, the internal RGB signals are switched off and the inserted signals are supplied to the output amplifiers. If only normal operation is wanted this pin should be connected to the negative supply. The switching times are very short ( < 20 ns) to avoid coloured edges of the inserted signals on the screen. 10. Luminance signal input The input signal should have a peak-to-peak amplitude of 0,45 V (peak white to sync) to obtain a black-white output signal to 5 V at nominal contrast. It must be a.c.-coupled to the input by a capacitor of about 22 nF. The signal is clamped at the input to an internal reference voltage. A 1 k Ω luminance delay line can be applied because the luminance input impedance is made very high. Consequently the charging and discharging currents of the coupling capacitor are very small and do not influence the signal level at the input noticeably. Additionally the coupling capacitor value may be small. |
Аналогичный номер детали - TDA3561A |
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Аналогичное описание - TDA3561A |
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