DESCRIPTION
The TDA9109A is a monolithic integrated circuit assembled in a 32-pin shrink dual in line plastic package. This IC controls all the functions related to the horizontal and vertical deflection in multimode or multi-frequency computer display monitors.
The internal sync processor, combined with the very powerful geometry correction block, make the TDA9109A suitable for very high performance monitors, using very few external components.
The horizontal jitter level is very low. It is particularly well-suited to high-end 15” and 17” monitors.
Combined with the ST7275 Microcontroller family, TDA9206 (Video preamplifier) and STV942x (On Screen Display controller), the TDA9109A allows fully I2C bus-controlled computer display monitors to be built with a reduced number of external com ponents

FEATURES
General
■ SYNC PROCESSOR
■ 12V SUPPLY VOLTAGE
■ 8V REFERENCE VOLTAGE
■ HORIZONTAL LOCK/UNLOCK OUTPUT
■ READ/WRITE I2C INTERFACE
■ VERTICAL MOIRE
■ B+ REGULATOR
   - Internal PWM generator for B+ current mode step-up converter
   - Switchable to step-down converter
   - I2C adjustable B+ reference voltage
   - Output Pulses Synchronized on Horizontal Frequency
   - Internal Maximum Current Limitation

Horizontal
■ Self-adaptative
■ Dual PLL concept
■ 150kHz maximum frequency
■ X-ray protection input
■ I2C controls: Horizontal duty-cycle, H-position

Vertical
■ Vertical ramp generator
■ 50 to 185Hz AGC loop
■ Geometry tracking with Vpos & Vamp
■ I2C controls: Vamp, Vpos, S-corr, C-corr
■ DC breathing compensation

I2C Geometry corrections
■ Vertical parabola generator
   (Pin Cushion - E/W, Keystone, Corner Correction)
■ Horizontal dynamic phase
   (Side Pin Balance & Parallelogram)
■ Horizontal and vertical dynamic focus (Horizontal focus amplitude, Horizontal focus symmetry, Vertical focus amplitude)