LMH1251 Switch Datasheet

LMH1251 Datasheet PDF, Equivalent


Part Number

LMH1251

Description

YPbPr to RGBHV Converter and 2:1 Video Switch

Manufacture

etcTI

Total Page 18 Pages
Datasheet
Download LMH1251 Datasheet


LMH1251
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
1
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.
1
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.
2
All other trademarks are the property of their respective owners.
3
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

LMH1251
LMH1251
SNLS193J – AUGUST 2005 – REVISED MARCH 2013
Connection Diagram
www.ti.com
H SYNCIN 1
V SYNCIN 2
RIN 3
GIN 4
BIN 5
GND 6
VCC 7
PR IN 8
PB IN 9
COLOR
DECODER
Y 10
Yc 11
GND 12
SYNC
PROCESSOR
24 INPUT SELECT
23
AUTO/MANUAL
DETECT SELECT
22 SD/HD SELECT*
21 POWER SAVE
20 ROUT
19 GOUT
18 BOUT
17 VCC
16 GND
15 REXT
14 H SYNCOUT
13 V SYNCOUT
Figure 1. 24-Pin TSSOP - Top View
See PW Package
Pin 23
0
0
1
1
Pin 24
0
1
Pin 22
0
1
Outputs 0(1)
Outputs 1(1)
Truth Table-Input Select
OUT
RGBHV input Ch
YPBPR input Ch
Truth Table- Format/Conversion Select
SYNC
Format Detection
Bi-Level
Manual
Tri-Level
Manual
Bi-Level
Auto
Tri-Level
Auto
Conversion Scheme
480i/480p
720p/1080i
480i/480p
720p/1080i
(1) When Pin 23 is set high, the LMH1251 is in Auto Mode, in which it can detect the incoming video format (SD or HD) and apply the
appropriate color conversion and sync processing. With Auto Mode, Pin 22 becomes an output pin, and will either output a logic high or
low to notify the user of the format that is being detected by the LMH1251. If Pin 23 is set low, the LMH1251 is in Manual Mode, in
which the user must specify the format with Pin 22. With Manual Mode, Pin 22 is an input pin. Since Pin 22 is a bi-directional pin, care
must be given not to apply any voltages to it when it is in the Auto Mode, in which it functions as an output pin. The use of the Auto
Mode with Pin 22 left floating is typically recommended.
Truth Table-Power Save
Pin 21
Low Power Mode
0 Disable
1 Enabled
2 Submit Documentation Feedback
Product Folder Links: LMH1251
Copyright © 2005–2013, Texas Instruments Incorporated


Features LMH1251 www.ti.com SNLS193J – AUGUST 2005 – REVISED MARCH 2013 LMH1251 Y PBPR to RGBHV Converter and 2:1 Video S witch Check for Samples: LMH1251 FEATU RES 1 •23 YPBPR to RGBHV Conversion YPBPR Path: 70 MHz, −3 dB, 700 mVP P 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 108 0p • Smart Video Format Detection for SD and HD • Power Save Mode APPLICAT IONS • TFT LCD Monitor • CRT Monito r • Set-Top Box • Display Projector DESCRIPTION The LMH1251 is a wideband 2:1 analog video switch with an integr ated YPBPR to RGBHV converter. The devi ce accepts one set of YPBPR inputs and one set of RGB/HSYNC/VSYNC inputs. Base d on the input selected, the output wil l be either a decoded TV or buffered PC video signal. The LMH1251 has a SYNC s eparator and processor that is capable of extracting sync timing information from both Standard Definition Television (SDTV) and Hig.
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