Datasheet > LM1292

LM1292

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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LM1292 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

www.national.com

12 3 4 5 6 7...10

中文翻译

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与LM1292相关器件

型号	品牌	获取价格	描述	数据表
LM1292N	NSC	获取价格	Video PLL System for Continuous-Sync Monitors
LM1295	NSC	获取价格	DC Controlled Geometry Correction System for Continuous Sync Monitors
LM1295N	NSC	获取价格	DC Controlled Geometry Correction System for Continuous Sync Monitors
LM1296	NSC	获取价格	Raster Geometry Correction System for Multi-Frequency Displays
LM1296N	NSC	获取价格	Raster Geometry Correction System for Multi-Frequency Displays
LM129AGMW8	FAIRCHILD	获取价格	IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, UUC, WAFER, Voltage Reference
LM129AH	Linear	获取价格	6.9V Precision Voltage Reference
LM129AH	NSC	获取价格	Precision Reference
LM129AH#PBF	Linear	获取价格	IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, MBCY2, LEAD FREE, METAL CAN, TO-46, 2 PIN,
LM129AH#TRPBF	Linear	获取价格	IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, MBCY2, LEAD FREE, METAL CAN, TO-46, 2 PIN,

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