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LMH1980

更新时间： 2024-11-22 11:12:23
品牌 Logo 应用领域
德州仪器 - TI PC
页数 文件大小 规格书
25页 1153K
描述
自动检测 SD/HD/PC 视频同步分离器

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LMH1980  
www.ti.com  
SNLS263A –JULY 2007–REVISED MARCH 2013  
LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator  
Check for Samples: LMH1980  
1
FEATURES  
DESCRIPTION  
The LMH1980 is an auto-detecting SD/HD/PC video  
sync separator ideal for use in a wide range of video  
applications, such as automotive LCD monitors, video  
capture & editing devices, surveillance & security  
equipment, and machine vision and inspection  
systems.  
2
•
Analog Video Sync Separation for NTSC, PAL,  
480I/P, 576I/P, 720P, 1080I/P/PsF, and Many  
VESA-Compatible Timing Formats  
•
Composite Video (CVBS), S-Video (Y/C), and  
Component Video (YPBPR/GBR) and PC  
Graphics (RGsB) Interfaces  
The LMH1980 accepts an analog video input signal  
with either bi-level or tri-level sync and automatically  
detects the video format, eliminating the need for  
external RSET resistor adjustment required by other  
sync separators (e.g.: LM1881). The outputs provide  
timing signals in CMOS logic, including Composite,  
Horizontal, and Vertical Syncs, Burst/Back Porch  
Timing, and Odd/Even Field outputs. The HD flag  
output (pin 5) provides a logic low signal only when a  
valid HD video input with tri-level sync is detected.  
The HD flag can be used to disable an external  
switch-controlled SD chroma filter when HD video is  
detected, or enable it when SD video is detected. For  
non-standard video with bi-level sync and without  
vertical serration pulses, a default vertical sync pulse  
will be output and no horizontal sync pulses will be  
output during the vertical sync interval.  
•
•
•
SD/PC Bi-Level Sync & HD Tri-Level Sync  
Compatible  
Composite, Horizontal, and Vertical Sync  
Outputs  
Burst/Back Porch Timing, Odd/Even Field, and  
HD Detect Flag outputs  
•
•
Automatic Video Format Detection  
Fixed-Level Sync Slicing for Video Inputs from  
0.5 to 2 VPP  
•
3.3V to 5V Supply Operation  
APPLICATIONS  
•
Consumer, Professional, Automotive &  
Industrial Video  
The LMH1980 is available in a space-saving 10-lead  
Mini-SO Package (VSSOP) and operates over a  
temperature range of −40°C to +85°C.  
•
•
•
•
Video Capture, Editing, and Processing  
Genlock Circuits  
Surveillance & Security Video Systems  
Set-Top Boxes (STB) & Digital Video  
Recorders (DVR)  
•
•
•
LCD / Plasma Displays and Video Projectors  
Machine Vision and Inspection Systems  
Video Trigger Oscilloscopes and Waveform  
Monitors  
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.  
2
All 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.  
Copyright © 2007–2013, Texas Instruments Incorporated  
1234567...25

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LMH1980 替代型号

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