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 (V_CC 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 O_H, 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.

• 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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• Function
• Sync separator
• Number of outputs
• 6
• Core supply voltage (V)
• 3.3, 5
• Output supply voltage (V)
• 3.3, 5
• Input type
• CMOS
• Output type
• CMOS
• Operating temperature range (C)
• -40 to 85
• Features
• Multi-Format Video Sync Separator
• Rating
• Catalog

LMH1981的完整型号有：LMH1981MT/NOPB、LMH1981MTX/NOPB，以下是这些产品的关键参数及官网采购报价：

LMH1981MT/NOPB，工作温度：-40 to 85，封装：TSSOP (PW)-14，包装数量MPQ：94个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMH1981MT/NOPB的批量USD价格：6.768（1000+）

LMH1981MTX/NOPB，工作温度：-40 to 85，封装：TSSOP (PW)-14，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMH1981MTX/NOPB的批量USD价格：5.727（1000+）

LMH1981MTEVAL — 用于 LMH1981 多格式视频同步分离器的评估板

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.

LMH1981 IBIS Model (Rev. B)

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