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LMH1981

更新时间： 2024-11-25 04:19:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
13页	680K
描述
Multi-Format Video Sync Separator

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中文翻译

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数据手册

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LMH1981 数据手册

PRELIMINARY

April 2006

LMH1981

Multi-Format Video Sync Separator

General Description

Features

n Standard analog video sync separation for NTSC, PAL,

SECAM, 480i/p, 576i/p, 720p, 1080i/p, and RGsB from

composite (CVBS), S-Video (Y/C), component (YP_BP_R),

and computer video interfaces

The LMH1981 is a high performance multi-format sync sepa-

rator ideal for use in a wide range of video applications, such

as broadcast and professional video equipment and HDTV/

DTV systems.

n Bi-level & tri-level sync compatible

The input accepts standard analog video signals with either

bi-level or tri-level sync, and the outputs provide all of the

critical timing signals in CMOS logic, including composite,

horizontal, and vertical syncs, burst/back porch timing, odd/

even field, and video format outputs. The horizontal sync

output features very low jitter, minimizing external circuitry

needed to clean and reduce jitter in subsequent sync pro-

cessing stages.

n Composite, horizontal, and vertical sync outputs

n Burst/back porch timing, odd/even field, and video

format Outputs

n Superior jitter performance on the H Sync

negative-going edge reference

n Automatic video format detection

n 50% sync slicing of video inputs from 0.5 V_PPto 2 V_PP

n Macrovision compatible

The LMH1981 automatically detects the input video format,

eliminating the need for programming using a microcontroller

or external R_SETresistor. The sync separator applies precise

50% sync slicing to ensure accurate sync extraction for

inputs with irregular amplitude, offset, and noise conditions.

Its unique video format feature (pin 9) outputs the total

vertical scan lines per frame as an 11-bit binary serial bit

stream, which can be decoded by the video system to de-

termine the input video format and enable dynamic adjust-

ment of system parameters, i.e.: color space or scaler con-

versions. The LMH1981 is available in a 14-pin TSSOP

package and operates over the full commercial temperature

range.

n 3.3V to 5V supply operation

Applications

n Broadcast and professional video equipment

n HDTV/DTV systems

n Genlock systems

n Video capture & digitization

n Set-top boxes (STB) & digital video recorders (DVR)

n Video displays

Connection Diagram

Pin Descriptions

Pin No.

Pin Name Pin Description

14-Pin TSSOP

R_EXT

Bias Current External Resistor

2, 5, 10

GND

Ground

3, 6, 11

V_CC

Supply Voltage

V_IN

Video Input

HSOUT

VSOUT

VFOUT

CSOUT

BPOUT

OEOUT

Horizontal Sync Output

Vertical Sync Output

Video Format Output

Composite Sync Output

Burst/Back Porch Timing Output

Odd/Even Field Output

20174501

Top View

FIGURE 1. Pinout

Ordering Information

Package

Part Number

LMH1981MT

LMH1981MTX

Package Marking

LMH1981MT

Transport Media

94 Units/Rail

NSC Drawing

14-Pin TSSOP

MTC14

2.5k Units Tape and Reel

DS201745

www.national.com

12 3 4 5 6 7...13

中文翻译

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与LMH1981相关器件

型号	品牌	获取价格	描述	数据表
LMH1981MT	NSC	获取价格	Multi-Format Video Sync Separator
LMH1981MT/NOPB	TI	获取价格	多格式视频同步分离器 \| PW \| 14 \| -40 to 85
LMH1981MTX	NSC	获取价格	Multi-Format Video Sync Separator
LMH1981MTX/NOPB	TI	获取价格	多格式视频同步分离器 \| PW \| 14 \| -40 to 85
LMH1982	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982	TI	获取价格	具有同步锁相的多速率视频时钟发生器
LMH1982SQ	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQ/NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQE	NSC	获取价格	Multi-Rate Video Clock Generator with Genlock
LMH1982SQE/NOPB	TI	获取价格	Multi-Rate Video Clock Generator with Genlock

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