Datasheet > LMH1251

LMH1251

更新时间： 2024-11-24 22:31:11

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器开关
页数	文件大小	规格书
10页	612K
描述
YPBPR to RGB Decoder and 2:1 Video Switch

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LMH1251 数据手册

August 2005

LMH1251

YP_BP_Rto RGB Decoder and 2:1 Video Switch

General Description

Features

n YP_BP_Rto RGB decoding

™

The LMH 1251 is a wideband 2:1 analog video switch with

an integrated YP_BP_Rto RGB decoder. The device accepts

one set of YP_BP_Rinputs and one set of RGB/HSYNC/

VSYNC inputs. Based on the input selected, the output will

be either a decoded TV or buffered PC video signal.

n YP_BP_Rpath: 70 MHz, −3 dB, 700 mV_PPbandwidth

n RGB path: 400 MHz, −3 dB, 700 mV_PPbandwidth

n Supports PC video display resolutions up to UXGA

(1600 x 1200 75 Hz)

The LMH1251 has a SYNC separator and processor that is

capable of extracting sync timing information from both Stan-

dard Definition Television (SDTV) and High Definition Tele-

vision (HDTV) inputs. It provides bi-level sync, and tri-level

sync separation.

n Supports 480i, 480p, 576i, 576p, 720p, 1080i, and

1080p

n Smart video format detection for SD and HD

n Power save mode

The color space conversion from YP_BP_Rto RGB in the

LMH1251 is realized with a very high precision fully analog

dematrixer that provides chrominance accuracy that is less

than 2.5% of amplitude & 1.5˚ of phase error on a vector-

scope. It is equipped with a smart video detection circuit

which automatically senses SDTV and HDTV video formats

and applies the appropriate color space conversion.

Applications

n TFT LCD monitor

n CRT monitor

n Set-top box

n Display projector

The LMH1251 is capable of handling SDTV, HDTV, XGA,

SXGA, and UXGA video formats, which makes it an ideal

solution for enhancing value in applications ranging from

LCD monitors, to set-top boxes, to projectors. The LMH1251

is available in a TSSOP-24 package.

Connection Diagram

24-Pin TSSOP

20151927

Top View

™

LMH is a trademark of National Semiconductor Corporation.

DS201519

www.national.com

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