LA7851

CRT Display Synchronization Deflection Circuit

Overview

The LA7850 is a sync deflection circuit IC dedicated to CRT display use. It can be connected to the LA7832, 7833, 7837, 7838 for vertical output use to form a sync deflection circuit that meets every requirement for CRT display use.

Features

• The horizontal oscillation frequency can be adjusted stably from 15kHz to 100kHz.

• The horizontal display can be shifted right/left.

• The horizontal/vertical sync input can be used intact regardless of the difference in pulse polarity and pulse width.

• The AFC feedback sawtooth wave can be obtained by simply applying a flyback pulse to the IC as a trigger

pulse.

• Any duty of the horizontal pulse can be set.

• Good vertical linearity because DC bias at vertical output stage is subject to sampling control within retrace time.

On-Chip Functions

[Horizontal Block]

• AFC

• Horizontal OSC

• X-ray protector

• Horizontal phase shift

• AFC sawtooth wave generator

• Horizontal pulse duty setting

[Vertical Block]

 • Vertical OSC

 • Vertical sawtooth wave generator

 • Sampling type DC voltage control