Datasheet > LM1292N

LM1292N

更新时间： 2024-11-11 22:51:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	221K
描述
Video PLL System for Continuous-Sync Monitors

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LM1292N 数据手册

April 1999

LM1292

Video PLL System for Continuous-Sync Monitors

General Description

Features

n Wide continuous autosync range — 22 kHz–125 kHz

(1:5.7) with no component switching or external

adjustments

The LM1292 is a very low jitter, integrated horizontal time

base solution specifically designed to operate in high perfor-

mance, 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 cir-

cuit.

n No manufacturing trims required — internal VCO

capacitor trimmed on chip

n No costly high-precision components needed

n Very low phase jitter (below 800 ps at 125 kHz)

n DC controlled H phase and duty cycle

n Video mute pulse for blanking during H frequency

transitions

Available sync processing includes a vertical sync separator

and a composite video sync stripper. An internal sync selec-

tion 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 LM1292

provides polarity-normalized H/HV and V sync outputs.

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 V_CC

powered down

n H drive disabled for V_CC9.5V

n Horizontal output transistor protected against accidental

turn-on during flyback

The

LM1292

design

uses

on-chip

FVC

(Frequency-to-Voltage Converter) to set the center fre-

quency of the VCO (Voltage-Controlled Oscillator). This

technique allows autosync operation over the entire fre-

quency range using just one optimized set of external com-

ponents.

The system includes a second phase detector which com-

pensates for storage time variation in the horizontal output

transistor; the picture’s horizontal position is thus indepen-

dent of temperature and component variance.

n Capacitor-programmable frequency ramping, df _vco/dt,

protects H output transistor during scanning mode

changes

The LM1292 provides DC control pins for H Drive duty cycle

and flyback phase.

Connection Diagram

DS012844-1

FIGURE 1. Order Number LM1292N

See NS Package Number N28B

DS012844

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