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GENERAL DESCRIPTION

The TDA2579B generates and synchronizes horizontal and vertical signals. The device has a 3 level sandcastle output; a transmitter identification signal and also 50/60 Hz identification.

Features

? Horizontal phase detector, (sync to oscillator), sync separator and noise inverter

? Triple current source in the phase detector with automatic selection

? Second phase detector for storage compensation of the horizontal output

? Stabilized direct starting of the horizontal oscillator and output stage from mains supply

? Horizontal output pulse with constant duty cycle value of 29 μs

? Internal vertical sync separator, and two integration selection times

? Divider system with three different reset enable windows

? Synchronization is set to 628 divider ratio when no vertical sync pulses and no video transmitter is identified

? Vertical comparator with a low DC feedback signal

? 50/60 Hz identification output combined with mute function

? Automatic amplitude adjustment for 50 and 60 Hz and blanking pulse duration

? Automatic adaption of the burst-key pulsewidth