LMH1251MT National Semiconductor, LMH1251MT Datasheet

LMH1251MT

Manufacturer Part Number

LMH1251MT

Description

IC,TV/VIDEO CIRCUIT,Video Switch,TSSOP,24PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LMH1251MT.pdf (10 pages)

2.LMH1251MT.pdf (11 pages)

3.LMH1251MT.pdf (10 pages)

Specifications of LMH1251MT

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LMH1251

General Description

The LMH

an integrated YP

one set of YP

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

be either a decoded TV or buffered PC video signal.

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.

The color space conversion from YP

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.

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

LMH

™

is a trademark of National Semiconductor Corporation.

™

1251 is a wideband 2:1 analog video switch with

to RGB Decoder and 2:1 Video Switch

inputs and one set of RGB/HSYNC/

to RGB decoder. The device accepts

DS201519

to RGB in the

24-Pin TSSOP

Top View

Features

n YP

n RGB path: 400 MHz, −3 dB, 700 mV

n Supports PC video display resolutions up to UXGA

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

n Smart video format detection for SD and HD

n Power save mode

Applications

n TFT LCD monitor

n CRT monitor

n Set-top box

n Display projector

(1600 x 1200

1080p

to RGB decoding

path: 70 MHz, −3 dB, 700 mV

75 Hz)

20151927

bandwidth

www.national.com

August 2005

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