Multimode high definition and personal computer monitor chip set

A new family of devices to simplify the design of multimode computer displays has been developed. This cost-effective and highly integrated system has been developed for personal computer and high-definition CRT displays. The range of signals with which the chip set can operate includes TTL (transistor transistor logic) and/or analog video, and composite or separate H and V TTL level sync. The horizontal timebase has frequency agility, enabling it to lock over a range of 15.5 kHz to 50 kHz automatically. The analog video bandwidth is in excess of 50 MHz. Four integrated circuits are included in the family: one is used exclusively for TTL-to-analog video conversion, the other three are variants of the timebase/video circuit. The main system functions are TTL-to-analog conversion, DC video contrast and brightness controls, video cascode drivers for video output stages, automatic sync source and polarity control, a vertical oscillator and ramp generator, a frequency agile horizontal timebase, and programmable drivers for horizontal frequency-dependent power MOSFET switching