TDA4504B

· Gain controlled vision IF amplifier
· Synchronous demodulator for negative and positive demodulation
· AGC detector operating on peak sync amplitude for negative demodulation and on peak white level for positive demodulation
· Tuner AGC
· AFC circuit with two control polarities and on/off-switch
· Video preamplifier
· Video switch to select either the internal video signal or an external video signal
· Horizontal oscillator and synchronization circuit with two control loops
· Vertical synchronization (divider system), ramp generator and driver with automatic amplitude adjustment for 50 and 60 Hz
· Transmitter identification (mute)
· Sandcastle pulse generation
· VCR/auto VCR switch
· Start-up circuit
· Vertical guard

Having the capability to demodulate IF signals with either positive or negative-going video information, the TDA4504B (Fig.1) is contained within a 32 pin.

encapsulation. It includes a three-stage vision IF amplifier, mute circuit, AFC and AGC circuitry, fully synchronised horizontal and vertical timebases with drive circuits and integral three-level sandcastle pulse generator.

A functional colour tv receiver of the TDA4504B can thus be realized with the addition of a tuner, audio demodulator and amplifier, chroma decoder and respective line and field deflection circuitry.