DESCRIPTION

The STV2145 is an I2C bus processor containing the vertical deflection East-West functions and oversize blanking. This circuit is foreseen as ADD-ON for the Video Chroma Processor STV2118A to permit 110° CRT applications covering standard 4/3 screen format and new 16/9 format with zoom and subtitle facilities. STV2145has been designed to drive a standard TDA8172/8177 vertical booster and an external transistor for East-West.

■ INTEGRATED VERTICAL SAWTOOTH GENERATOR WITH AMPLITUDE CONTROL LOOP (50Hz - 60Hz)

■ INTERLACE MODE INTRINSICALLY CONTROLLED BY STV2118A

■ VERTICAL SIZE CORRECTION (BREATHING) TO ADAPT DEFLECTION SENSITIVITY TO THE CURRENT BEAM (HIGH VOLTAGE VARIATION)

■ BUS ADJUSTED VERTICAL PARAMETERS : VERTICAL AMPLITUDE, VERTICAL POSITION AND S-CORRECTION

■ EAST-WEST FUNCTION GENERATOR WITH INTEGRATED ERROR AMPLIFIER (THUS, ONLY 1 EXTERNAL POWER DARLINGTON IS NECESSARY FOR EW-FUNCTION)

■ BUS CONTROLLED EAST-WEST FUNCTIONS : EW-AMPLITUDE, HORIZONTAL WIDTH, EW-TILT AND EW-SHAPE (CORNER CORRECTION)

■ OVERSIZE BLANKING (VERTICAL AND HORIZONTAL) WHICH PERMIT ZOOM AND SUBTITLE FACILITIES FOR 4/3 AND 16/9 CRTs