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LM1290 - Autosync Horizontal Deflection Processor

General Description

The LM1290 is a high-performance, low-cost deflection solution for autosync monitors.

The LM1290 provides full autosync capability, DC controls and complete freedom from manufacturing trims.

Its continuous capture range is from 22 kHz to 110 kHz (1:5).

Key Features

  • n Full autosync.
  • 22 kHz to 110 kHz with no component switching or external adjustments n No manufacturing trims needed.
  • internal VCO capacitor trimmed on chip n Sample-and-hold circuit for fast top-of-screen phase recovery, even when using composite sync n DC-controlled H phase and duty cycle n Resistor-programmable minimum VCO frequency n Excellent jitter performance n X-ray input disables H drive until VCC powered down n Low VCC disables H drive (VCC < 8.5V) n H output transi.

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LM1290 Autosync Horizontal Deflection Processor January 1997 LM1290 Autosync Horizontal Deflection Processor General Description The LM1290 is a high-performance, low-cost deflection solution for autosync monitors. The LM1290 provides full autosync capability, DC controls and complete freedom from manufacturing trims. Its continuous capture range is from 22 kHz to 110 kHz (1:5). Mode change frequency ramping, for protection of the horizontal deflection output transistor, is programmable by using an external capacitor. Together with the National Semiconductor LM1296 Raster Geometry Correction System for Multi-Frequency Displays, excellent performance is offered. The two-chip solution provides the advantage of good jitter performance, simplified board layout, and lower system cost.