FEATURES

23• YPBPR to RGBHV Conversion

• YPBPR Path: 70 MHz, −3 dB, 700 mVPP

Bandwidth

• RGB Path: 400 MHz, −3 dB, 700 mVPP

Bandwidth

• Supports PC Video Display Resolutions up to

UXGA (1600 x 1200 @ 75 Hz)

• Supports 480i, 480p, 576i, 576p, 720p, 1080i,

and 1080p

• Smart Video Format Detection for SD and HD

• Power Save Mode

APPLICATIONS

• TFT LCD Monitor

• CRT Monitor

• Set-Top Box

• Display Projector

DESCRIPTION

The LMH1251 is a wideband 2:1 analog video switch

with an integrated YPBPR to RGBHV converter. The

device accepts one set of YPBPR inputs 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.

The LMH1251 has a SYNC separator and processor

that is capable of extracting sync timing information

from both Standard Definition Television (SDTV) and

High Definition Television (HDTV) inputs. It provides

bi-level sync, and tri-level sync separation.

The color space conversion from YPBPR to RGB in

the LMH1251 is realized with a very high precision

fully analog dematrixer which provides superior chroma accuracy that is less than 2.5% of amplitude

and 1.5° of phase error on a vectorscope. 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 part of the LMH™ high

speed amplifier family, and is offered in a 24-pin

TSSOP package.