The LM1291 is an integrated horizontal time base solution specifically designed to operate in continuous-sync video monitors It automatically synchronizes to any H frequency from 22 kHz to 125 kHz and provides the drive pulse to the high power deflection circuit Available sync processing includes a
Features
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Wide continuous autosync range 22 kHz to 125 kHz (1 5 7) with no component switching or external adjustments No manufacturing trims required internal VCO capacitor trimmed on chip No costly high-precision components needed Low phase jitter (1 3 ns at 100 kHz) DC controlled H phase and duty cycle Video mute pulse for blanking during H frequency transitions Input sync prioritization Clamp pulse position and width control Continuous clamp pulse output even with no.
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LM1291 Video PLL System for Continuous-Sync Monitors
June 1995
LM1291 Video PLL System for Continuous-Sync Monitors
General Description
The LM1291 is an integrated horizontal time base solution specifically designed to operate in continuous-sync video monitors It automatically synchronizes to any H frequency from 22 kHz to 125 kHz and provides the drive pulse to the high power deflection circuit Available sync processing includes a vertical sync separator and a composite video sync stripper An internal sync selection scheme gives highest priority to separate H and V sync then composite sync and finally sync on video no external switching between sync sources is necessary The LM1291 provides polarity-normalized H HV and V sync outputs along with logic flags which show the respective input
LM1291 Datasheet
