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LMH1981

更新时间： 2024-11-22 11:13:31
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
27页 893K
描述
多格式视频同步分离器

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LMH1981 数据手册

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LMH1981  
www.ti.com  
SNLS214H –APRIL 2006–REVISED MARCH 2013  
LMH1981 Multi-Format Video Sync Separator  
Check for Samples: LMH1981  
1
FEATURES  
DESCRIPTION  
The LMH1981 is a high performance multi-format  
sync separator ideal for use in a wide range of video  
applications, such as broadcast and professional  
video equipment and HDTV/DTV systems.  
2
•
Standard Analog Video Sync Separation for  
NTSC, PAL, 480I/P, 576I/P, 720P, and  
1080I/P/PsF from Composite Video (CVBS),  
S-Video (Y/C), and Component Video  
(YPBPR/GBR) Interfaces  
The input accepts standard analog SD/ED/HD video  
signals with either bi-level or tri-level sync, and the  
outputs provide all of the critical timing signals in  
CMOS logic, which swing from rail-to-rail (VCC and  
GND) including Composite, Horizontal, and Vertical  
Syncs, Burst/Back Porch Timing, Odd/Even Field,  
and Video Format Outputs. HSync features very low  
jitter on its leading (falling) edge, minimizing external  
circuitry needed to clean and reduce jitter in  
subsequent clock generation stages.  
•
•
Bi-Level & Tri-Level Sync Compatible  
Composite, Horizontal, and Vertical Sync  
Outputs  
•
•
Burst/Back Porch Timing, Odd/Even Field, and  
Video Format Outputs  
Superior Jitter Performance on Leading Edge  
of HSync  
•
•
Automatic Video Format Detection  
The LMH1981 automatically detects the input video  
format, eliminating the need for programming using a  
microcontroller, and applies precise 50% sync slicing  
to ensure accurate sync extraction at OH, even for  
inputs with irregular amplitude from improper  
termination or transmission loss. Its unique Video  
Format Output conveys the total horizontal line count  
per field as an 11-bit binary serial data stream, which  
can be decoded by the video system to determine the  
input video format and enable dynamic adjustment of  
system parameters, i.e.: color space or scaler  
conversions. The LMH1981 is available in a 14-pin  
TSSOP package and operates over a temperature  
range of −40°C to +85°C.  
50% Sync Slicing for Video Inputs from 0.5 VPP  
to 2 VPP  
•
3.3V to 5V Supply Operation  
APPLICATIONS  
•
•
•
•
•
Broadcast and Professional Video Equipment  
HDTV/DTV Systems  
Genlock Circuits  
Video Capture Devices  
Set-Top Boxes (STB) & Digital Video  
Recorders (DVR)  
•
Video Displays  
Connection Diagram  
R
1
2
3
4
5
6
7
14  
OEOUT  
EXT  
13 BPOUT  
GND  
V
12  
11  
CSOUT  
CC1  
V
IN  
V
CC3  
LMH1981  
GND  
10 GND  
V
9
8
VFOUT  
VSOUT  
CC2  
HSOUT  
Figure 1. 14-Pin TSSOP - Top View  
See PW 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.  
All trademarks are the property of their respective owners.  
2
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 © 2006–2013, Texas Instruments Incorporated  
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LMH1981 替代型号

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