Product details

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
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
TSSOP (PW) 14 32 mm² 5 x 6.4
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

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.

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Design & development

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Evaluation board

LMH1981MTEVAL — Evaluation Board for the LMH1981 Multi-Format Video Sync Separator

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.

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Simulation model

LMH1981 IBIS Model (Rev. B)

SNLM154B.ZIP (51 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

TIDA-00424 — Video Sync and Video Clock Generation and Distribution Reference Design

A video clock sub-system designed to perform video sync separation and derives synchronous video clocks for video and audio sub-systems.
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TSSOP (PW) 14 View options

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