Features 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 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 TSSOP-24 package. Applications TFT LCD monitor CRT monitor Set-top box Display projector

Also Recommended LMH6733 Wideband, Low-distortion Triple Video Amplifier LMH6739 Wideband, Low-distortion Triple Video Buffer LMH6734 Wideband, Low-distortion Triple Video Buffer Test Circuit

Typical Application *click for larger image Test Circuit	Block Diagram *click for larger image Internal Schematic and Connection Diagram
Typical Performance click for larger image

Parameters Values Function Analog Video Converter Supported Video Formats RGBHV: Up to 1600x1200 @ 75 Hz, YPbPr: 480i/p, 720p, 1080i/p Supply Voltage 5 Volt OtherSupply Voltage Undefined Temperature Min 0 deg C Temperature Max 70 deg C

Datasheets

Title		Size	Date	Other Language
	LMH1251 YPbPr to RGBHV Converter and 2:1 Video Switch	304 Kbytes	2-Jul-08	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0	2267 Kbytes	24-Jun-08

Other Technical Documents

Title		Type	Date
	Enabling HDTV Capabilities in Today’s Systems	Technology Edge	2005-09-01

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH1251MT/NOPB LMH1251MT RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 178 AVNET-EM Worldwide 36 DIGI-KEY Worldwide 34 FARNELL Europe and Asia 136 MOUSER Worldwide 116 NEWARK Americas 8 RS COMPONENTS Worldwide 34 TAYLOR Americas 653	$5.50 each at 100+ pcs	rail of 61
LMH1251MTX/NOPB LMH1251MTX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 1001 DIGI-KEY Worldwide 0 KEIKONG Asia Pacific 5000	$5.50 each at 100+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1251.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1251 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH1251EVAL/NOPB	YPbPr to RGBHV Converter and 2:1 Video Switch	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1 TAYLOR Americas 1	$151.00 each	1
Thank you for your interest in the LMH1251. The LMH1251 is the industry's First High-Definition Analog Video Converter IC. Contents: 1 Fully Assembled Evaluation Board for the LMH1251 1 Datasheet for the LMH1251 1 Datasheet for the LMH6739 1 Evaluation Board Manual 1 AC Adapter 1 National Amplifiers Selection Guide

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMH1251MT/NOPB LMH1251MT	83.622 84.003	TSSOP	24	1 1	260 260	Detail	Download	N/A	NSUZXYTTE# LMH1251 MT
LMH1251MTX/NOPB LMH1251MTX	83.622 84.002	TSSOP	24	1 1	260 260	Detail	Download	N/A	NSUZXYTTE# LMH1251 MT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1251.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1251 is located at RoHS Status.

CAD Symbols and Models Download LMH1251 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH1251MT	CMOS7	0	21301	0	0	1584000	3	449464325
LMH1251MTX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1251.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1251 is located at RoHS Status.

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