LM1292 Datasheet | National Semiconductor

Description The LM1292 is a very low jitter, integrated horizontal time base solution specifically designed to operate in high performance, continuous-sync video monitors. It automatically synchronizes to any H frequency from 22 k Hz to 125 k Hz and provides the drive pulse to the high power deflection circuit. Available sync processing includes a vertical sync separator and a posite video sync stripper. An internal sync selection scheme gives highest priority to separate H and V sync, then posite sync, and finally sync on video; no external switching between sync sources is necessary. The LM1292 provides polarity-normalized H/HV and V sync outputs. The LM1292 design uses an on-chip FVC (Frequency-to-Voltage Converter) to set the center frequency of the VCO (Voltage-Controlled Oscillator). This technique allows autosync operation over the entire frequency range using just one optimized set of external ponents. The system includes a second phase detector which pensates for storage time variation in the horizontal output transistor; the picture’s horizontal position is thus independent of temperature and ponent variance. The LM1292 provides DC control pins for H Drive duty cycle and flyback phase. Features n Wide continuous autosync range - 22 k Hz- 125 k Hz (1:5.7) with no ponent switching or external adjustments n No manufacturing trims required - internal VCO capacitor trimmed on chip n No costly high-precision ponents needed n Very low phase jitter (below 800 ps at 125 k Hz) n DC controlled H phase and duty cycle n Video mute pulse for blanking during H frequency transitions n Input sync prioritization n Clamp pulse position and width control n Continuous clamp pulse output, even with no sync input n Resistor-programmable minimum and maximum VCO frequency n X-ray input disables H drive and mutes video until VCC powered down n H drive disabled for VCC < 9.5V n Horizontal output transistor protected against accidental turn-on during flyback n Capacitor-programmable...