LMH1981
- 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 - 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
- 50% Sync Slicing for Video Inputs from 0.5 VPP to 2 VPP
- 3.3V to 5V Supply Operation
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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.
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.
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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LMH1981 Multi-Format Video Sync Separator datasheet (Rev. H) | 2013/3/15 | |||
| 選擇指南 | Broadcast and Professional Video Interface Solutions (Rev. E) | PDF | HTML | 2017/4/5 | |||
| 應用說明 | Migrating From the LM1881 to the LMH1980 (Rev. A) | 2013/5/3 | ||||
| 應用說明 | Triple Rate SDI IP FPGA Resource Utilization on SDXILEVK/AES-EXP-SDI-G Ref Dsgn (Rev. A) | 2013/4/26 | ||||
| 應用說明 | Demonst SMPTE-Compliant SDI Out Jittr Using LMH1982 & Virtx-5 GTP Xmittr (Rev. A) | 2013/4/26 | ||||
| 應用說明 | A 3 Gbps SDI Connectivity Solution Supporting Uncompressed 1080p60 Video | 2008/3/18 | ||||
| 應用說明 | Timing is Everything Çô The Broadcast Video Signal Path | 2007/8/2 | ||||
| 設計指南 | Broadcast Video Owner's Manual | 2006/11/17 | ||||
| 白皮書 | Improving Video Clock Generation in Modern Broadcast Video Systems | 2006/7/1 |
設計與開發
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LMH1981MTEVAL — 適用於 LMH1981 多格式影片同步分離器的評估板
The LMH1981 Evaluation Board can be used to evaluate the LMH1981 Multi-Format Sync Separator and as a reference for designing the PCB layout. Refer to the LMH1981 datasheet for more information on PCB layout considerations.
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 14 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。