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LM1291 Datasheet Video Pll System

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM1291 Video PLL System for Continuous-Sync Monitors June 1995 LM1291 Video PLL System for Continuous-Sync.

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 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 LM1291 provides polarity-normalized H HV and V sync outputs along with logic flags which show the respective input polarities The design uses an on-chip FVC (Frequency-to-Voltage Converter) to set the center frequency of the VCO (VoltageControlled 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 LM1291 provides DC control pins for H Drive duty cycle and flyback phase

Key Features

  • Y Y Y Y Y Y Y Y Y Y Y Y Y Y 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.

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
LM129 Precision Reference
LM1290 Autosync Horizontal Deflection Processor
LM1292 Video PLL System
LM1295 DC Controlled Geometry Correction System
LM1296 Raster Geometry Correction System
LM120 3-Terminal Negative Regulators
LM1201 Video Amplifier System
LM1202 230MHz Video Amplifier System
LM1203 RGB Video Amplifier System
LM1203A 150MHz RGB Video Amplifier System

LM1291 Distributor