LMH1251 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – YPBPR to RGB Decoder and 2:1 Video Switch

LMH1251
www.ti.com
SNLS193J – AUGUST 2005 – REVISED MARCH 2013
LMH1251 YP_BP_R to RGBHV Converter and 2:1 Video Switch
Check for Samples: LMH1251
FEATURES
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•23 YP_BP_R to RGBHV Conversion
• YP_BP_R Path: 70 MHz, −3 dB, 700 mV_PP
Bandwidth
• RGB Path: 400 MHz, −3 dB, 700 mV_PP
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 YP_BP_R to RGBHV converter. The
device accepts one set of YP_BP_R 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 YP_BP_R 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.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
LMH is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2013, Texas Instruments Incorporated