GENERAL DESCRIPTION
As depicted in Figure 1, the TEA2028 combines 3 major functions of a TV set as follows :
- Horizontal (line) and vertical (frame) time base generation for spot deviation. The video signal is used for the synchronization of both time bases.
- On-chip switching power supply controller synchronized on line frequency.
This integrated circuit has been implemented in bipolar I2L technology, and various functions are digitally processed. In fact, resorting to logic functions has the advantage of working with pure and accurate signals while full benefit is drawn from
high integration of logic gates (approx. 110 gates per mm²).
The main objective is to drive all functions using an accurate time base generated by a master 500kHz oscillator.