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TDA8362 Datenblatt(PDF) 8 Page - NXP Semiconductors |
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TDA8362 Datenblatt(HTML) 8 Page - NXP Semiconductors |
8 / 36 page March 1994 8 Philips Semiconductors Objective specification Integrated PAL and PAL/NTSC TV processors TDA8360; TDA8361; TDA8362 VFB 41 vertical feedback input VRAMP 42 vertical ramp generator VOUT 43 vertical output AFCOUT 44 AFC output IFIN1 45 IF input 1 IFIN2 46 IF input 2 AGCOUT 47 tuner AGC output DECAGC 48 AGC decoupling capacitor TUNEADJ 49 tuner take-over adjustment AUOUT 50 audio output DECDEM 51 decoupling sound demodulator DECBG 52 decoupling bandgap supply SYMBOL PIN DESCRIPTION TDA8360 The TDA8360 has the following differences to the pinning: Pin 6: external audio input not connected Pin 15: external CVBS input not connected Pin 16: chrominance and A/V switch input not connected Pin 27: hue control input not connected. TDA8361 The TDA8361 has the following differences to the pinning: Pin 1: only audio de-emphasis Pin 27: only hue control Pin 32: 4.43 MHz output for TDA8395 is not connected. FUNCTIONAL DESCRIPTION Video IF amplifier The IF amplifier contains 3 AC-coupled control stages with a total gain control range of greater than 60 dB. The sensitivity of the circuit is comparable with that of modern IF ICs. The reference carrier for the video demodulator is obtained by means of passive regeneration of the picture carrier. The external reference tuned circuit is the only remaining adjustment of the IC. In the TDA8362 the polarity of the demodulator can be switched so that the circuit is suitable for both positive and negative modulated signals. The AFC circuit is driven with the same reference signal as the video demodulator. To ensure that the video content does not disturb the AFC operation a sample-and-hold circuit is incorporated; the capacitor for this function is internal. The AFC output voltage is 6 V. The AGC detector operates on levels, top sync for negative modulated and top white for positive modulated signals.The AGC detector time constant capacitor is connected externally. This is mainly because of the flexibility of the application. The time constant of the AGC system during positive modulation (TDA8362) is slow, this is to avoid any visible picture variations. This, however, causes the system to react very slowly to sudden changes in the input signal amplitude. To overcome this problem a speed-up circuit has been included which detects whether the AGC detector is activated every frame period. If, during a 3-frame period, no action is detected the speed of the system is increased. When the incoming signal has no peak white information (e.g. test lines in the vertical retrace period) the gain would be video signal dependent. To avoid this effect the circuit also contains a black level AGC detector which is activated when the black level of the video signal exceeds a certain level. The TDA8361 and TDA8362 contain a video identification circuit which is independent of the synchronization circuit. Therefore search tuning is possible when the display section of the receiver is used as a monitor. In the TDA8360 this circuit is only used for stable OSD at no signal input. In the normal television mode the identification output is connected to the coincidence detector, this applies to all three devices. The identification output voltage is LOW when no transmitter is identified. In this condition the sound demodulator is switched off (mute function). When a transmitter is identified the output voltage is HIGH. The voltage level is dependent on the frequency of the incoming chrominance signal. |
Ähnliche Teilenummer - TDA8362 |
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Ähnliche Beschreibung - TDA8362 |
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