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TDA8349A датащи(PDF) 4 Page - NXP Semiconductors |
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TDA8349A датащи(HTML) 4 Page - NXP Semiconductors |
4 / 17 page February 1991 4 Philips Semiconductors Product specification Multistandard IF amplifier and demodulator TDA8349A PINNING PIN DESCRIPTION 1,2 balanced IF inputs 3 tuner AGC starting point adjustment 4 tuner AGC output 5 AGC time constant 6 AFC on/off switch and sample-and-hold capacitor 7 video switch 8 AFC output Q1 9 AFC output Q2 10 video switch external input 11 video output 12 video switch internal input 13 video switch output 14 positive supply voltage 15,16 reference tuned circuit for demodulator 17 ground 18 mute output 19 coincidence filter 20 system switch FUNCTIONAL DESCRIPTION General The IC consists of the following parts as illustrated in Fig.1: • Gain controlled video IF amplifier • Quasi-synchronous demodulator • Video amplifier/buffer with white spot clamp/inverter and noise clamp • AGC circuit which operates either on top sync level (negative modulation) or on white level (positive modulation) or on top level (MAC) • AFC circuit with sample-and-hold circuit for negatively modulated signals, on/off switch and a digital or analog output (switchable) • Circuit for switching between positive and negative modulation • Video recognition circuit for sound muting and tuning indication • Video switch which facilitates selection between two different video signals, with different gain settings IF amplifier The IF amplifier consists of three AC coupled differential gain stages with adjustable feedback in the emitter. The AC coupling allows simple biasing, cascades can be used and no DC feedback is required. This provides a control range above 70 dB with good linearity. The minimum input signal to obtain the nominal output amplitude is 50 µV RMS. Demodulator The demodulator is a quasi-synchronous circuit that employs passive carrier regeneration and a tuned circuit for selectivity. The regenerated carrier signal is limited by a clamping circuit before it is fed to the demodulator. Switching between positive and negative modulation is achieved by the system switch which provides currents to the demodulator in a positive or negative direction. Video amplifier The video amplifier based on the feedback principle improves the linearity of the video output buffer. It has an internal bandgap reference to ensure a stable video output at different supply voltages and temperatures. This |
Аналогичный номер детали - TDA8349A |
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Аналогичное описание - TDA8349A |
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