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Product details

Parameters

Operating temperature range (C) 0 to 70 open-in-new Find other Other interfaces

Package | Pins | Size

TSSOP (PW) 24 34 mm² 7.7 x 4.4 open-in-new Find other Other interfaces

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

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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.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LMH1251 YP B P R to RGBHV Converter and 2:1 Video Switch datasheet (Rev. J) Mar. 15, 2013
User guides AN-1836 LMH1251 Evaluation Board Users Guide v2.0 (Rev. A) Apr. 26, 2013
White papers Enabling HDTV Capabilities in Today‚'s Systems Sep. 01, 2005

Design & development

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Design tools & simulation

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PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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TSSOP (PW) 24 View options

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