Part # LM1292 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM1292 Video PLL System for Continuous-Sync Monitors


Part Details:

LM1292 April 1999 V LM1292 ideo Video PLL System for Continuous-Sync Monitors PLL General Description Features The LM1292 is a very low jitter, integrated horizontal time n Wide continuous autosync range -- 22 kHz­125 kHz System base solution specifically designed to operate in high perfor- (1:5.7) with no component switching or external mance, continuous-sync video monitors. It automatically adjustments synchronizes to any H frequency from 22 kHz to 125 kHz n No manufacturing trims required -- internal VCO and provides the drive pulse to the high power deflection cir- capacitor trimmed on chip cuit. n No costly high-precision components needed Available sync processing includes a vertical sync separator n Very low phase jitter (below 800 ps at 125 kHz) for and a composite video sync stripper. An internal sync selec- n DC controlled H phase and duty cycle tion scheme gives highest priority to separate H and V sync, n Video mute pulse for blanking during H frequency Continuous-Sync then composite sync, and finally sync on video; no external transitions switching between sync sources is necessary. The LM1292 n Input sync prioritization provides polarity-normalized H/HV and V sync outputs. n Clamp pulse position and width control The LM1292 design uses an on-chip FVC n Continuous clamp pulse output, even with no sync input (Frequency-to-Voltage Converter) to set the center fre- n Resistor-programmable minimum and maximum VCO quency of the VCO (Voltage-Controlled Oscillator). This frequency technique allows autosync operation over the entire fre-quency range using just one optimized set of external com- n X-ray input disables H drive and mutes video until VCC powered down ponents. n H drive disabled for V < 9.5V The system includes a second phase detector which com-


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LM1292.pdf Datasheet