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LMH1251

www.ti.com

SNLS193J –AUGUST 2005–REVISED MARCH 2013

LMH1251 YP

to RGBHV Converter and 2:1 Video Switch

Check for Samples: LMH1251

FEATURES

DESCRIPTION

The LMH1251 is a wideband 2:1 analog video switch

• YP

to RGBHV Conversion

with an integrated YP

to RGBHV converter. The

• YP

Path: 70 MHz, −3 dB, 700 mV

device accepts one set of YP

inputs and one set

Bandwidth

of RGB/HSYNC/VSYNC inputs. Based on the input

• RGB Path: 400 MHz, −3 dB, 700 mV

selected, the output will be either a decoded TV or

buffered PC video signal.

Bandwidth

• Supports PC Video Display Resolutions up to

The LMH1251 has a SYNC separator and processor

UXGA (1600 x 1200 @ 75 Hz)

that is capable of extracting sync timing information

from both Standard Definition Television (SDTV) and

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

High Definition Television (HDTV) inputs. It provides

and 1080p

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

• Smart Video Format Detection for SD and HD

The color space conversion from YP

to RGB in

• Power Save Mode

the LMH1251 is realized with a very high precision

fully analog dematrixer which provides superior

APPLICATIONS

chroma accuracy that is less than 2.5% of amplitude

and 1.5° of phase error on a vectorscope. It is

• TFT LCD Monitor

equipped with a smart video detection circuit which

• CRT Monitor

automatically senses SDTV and HDTV video formats

• Set-Top Box

and applies the appropriate color space conversion.

• Display Projector

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.

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.

2LMH is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

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.

Summary of content (19 pages)

PAGE 1
LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 LMH1251 YPBPR to RGBHV Converter and 2:1 Video Switch Check for Samples: LMH1251 FEATURES 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.
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LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com Connection Diagram H SYNCIN 1 24 INPUT SELECT V SYNCIN 2 23 AUTO/MANUAL DETECT SELECT RIN 3 22 SD/HD SELECT* GIN 4 21 POWER SAVE BIN 5 20 ROUT GND 6 19 GOUT VCC 7 18 BOUT PR IN 8 17 VCC 16 GND 15 REXT 14 H SYNCOUT 13 V SYNCOUT PB IN 9 Y 10 Yc 11 COLOR DECODER SYNC PROCESSOR GND 12 Figure 1.
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LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) (3) Susceptibility (4) ESD Tolerance Machine Model 4.0 kV (5) 400V Supply Voltage VCC, Pins 7 and 17 5.5V VCC −0.5 ≥ VIN ≥ 0V Voltage at any Input Pin (VIN) 0.0V ≤ VIN ≤ 1.
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LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com Video Signal Electrical Characteristics Unless otherwise noted: TA = 25°C, VCC = +5.0V, RGB VideoIN = 0.7 VPP, Y VideoIN = 0.7 VPP, PBPR VideoIN = ±350 mV, CL = 8 pF, Video Outputs = 0.7 VPP.
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LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 Video Signal Electrical Characteristics (continued) Unless otherwise noted: TA = 25°C, VCC = +5.0V, RGB VideoIN = 0.7 VPP, Y VideoIN = 0.7 VPP, PBPR VideoIN = ±350 mV, CL = 8 pF, Video Outputs = 0.7 VPP.
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LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com System Interface Signal Characteristics Unless otherwise noted: TA = 25°C, VCC = +5.0V, Y VideoIN = 0.7 VPP, PBPR VideoIN = ±350 mV, CL = 8 pF, Video Outputs = 0.7 VPP. Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units VIL Logic Low Input Voltage (Pins 24, 23, 22, 21) −0.5 1.5 V VIH Logic High Input Voltage (Pins 24, 23, 22, 21) 3.0 VCC +0.5 V IL Logic Low Input Current (Pins 24, 23, 22, 21) Input Voltage = 0.
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LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 Typical Performance Characteristics Unless otherwise noted: TA = 25°C, VCC = +5.0V, RGB VideoIN = 0.7 VPP, Y VideoIN = 0.7 VPP, PBPR VideoIN = ±350 mV, CL = 8 pF, Video Outputs = 0.7 VPP. Large Signal Frequency Response 4 CL || 10 k: 2 -20 RS = 50: 0 CL = 4.5 pF -2 -30 CROSSTALK (dBc) NORMALIZED GAIN (dB) Crosstalk vs.
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LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION GENERAL INFORMATION The LMH1251 is a high speed triple 2:1 video multiplexer with an integrated sync processor and color space converter. One input channel accepts standard RGBHV PC graphics video and the second input channel accepts YPBPR component video. If the first input of the MUX is selected, the device will output the RGBHV video from the input with unity gain.
PAGE 9
LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 MACROVISION COMPATIBILITY The LMH1251 is compatible with the Macrovision Video Copy Protection System commonly used in 480p/576p progressive-scan DVD video sources. The LMH1251 does not support 480i/576i formats with Macrovision enabled. Macrovision, which is enabled by special circuitry inside many DVD players, embeds pseudo sync pulses and pseudo video pulses into the source signal during the vertical blanking interval.
PAGE 10
LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com The RGBHV outputs cannot be used to drive standard 150Ω video loads and require high-bandwidth buffers for this kind of application. For example, if the LMH1251 is to be designed into a stand-alone converter box application, the configuration in Figure 8 is recommended.
PAGE 11
LMH1251 www.ti.
PAGE 12
LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com Test Circuit 1 k: 100: 1 H SYNCIN INPUT SELECT 24 2 V SYNCIN AUTO/MANUAL DETECT SELECT 23 3 RIN SD/HD SELECT* 22 4 GIN POWER SAVE 21 5 BIN ROUT 20 1 6 GND GOUT 19 2 7 VCC BOUT 18 1 k: 75: 33: 75: 33: 75: VCC 75: 75: 75: 33: + 10 PF 33: 33: 33: 0.22 PF 100: 100: 100: 0.22 PF 0.22 PF 0.1 PF 3 0.22 PF 8 PR IN VCC 9 PB IN GND 10 Y REXT 11 SYNC on Y 0.22 PF 0.22 PF 17 + 0.
PAGE 13
LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision I (March 2013) to Revision J • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMH1251MTX/NOPB Package Package Pins Type Drawing TSSOP PW 24 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 6.95 B0 (mm) K0 (mm) P1 (mm) 8.3 1.6 8.0 W Pin1 (mm) Quadrant 16.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH1251MTX/NOPB TSSOP PW 24 2500 367.0 367.0 35.
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