TDA5666-5

Video Modulator for FM-Audio TDA 5666-5 Preliminary Data Features q q q q q q q q q q q Bipolar IC FM-audio modulator Sync level clamping of video input signal Controlling of peak white value Continuous adjustment of modulation depth for positive or negative values Symmetrical mixer output with separate ground area Symmetrical oscillator with separate RF-ground Low spurious radiation High stability of the RF-oscillator frequency High stability of the audio oscillator Internal reference voltage 12 V supply voltage P-DIP-18 -5 Type TDA 5666-5 Ordering Code Q67000-A5168 Package P-DIP-18-5 Functional Description and Application The monolitic integrated circuit TDA 5666-5 is especially suitable as a modulator for the 48- to 860-MHz frequency range. Video recorders, cable converters, TV-converter networks, demodulators, video generators, video security systems, amateur TV-applications and personal computers. Semiconductor Group 1 02.95 TDA 5666-5 Circuit Description Oscillator The RF-oscillator is available at pins 3-7. The oscillator operates as a symmetrical Colpitts circuit. The oscillator chip ground, pin 5, should be connected to ground at the resonance circuit shielding point. An external oscillator can be injected inductively or capacitively via pins 3 and 7. The layout of the PCB should be such as to provide a minimum shielding attenuation between the oscillator pins 3-7 and modulator output pins 13-15 of approximately 80 dB. For optimal residual carrier suppr...