REXT

GND

VCC1

VIN

GND

VCC2

HSOUT

OEOUT

BPOUT

CSOUT

VCC3

GND

VFOUT

VSOUT

LMH1981

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3

4

5

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14

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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

2

•

Standard Analog Video Sync Separation for

sync separator ideal for use in a wide range of video

NTSC, PAL, 480I/P, 576I/P, 720P, and

applications, such as broadcast and professional

1080I/P/PsF from Composite Video (CVBS),

video equipment and HDTV/DTV systems.

S-Video (Y/C), and Component Video

The input accepts standard analog SD/ED/HD video

(YPBPR/GBR) Interfaces

signals with either bi-level or tri-level sync, and the

•

Bi-Level & Tri-Level Sync Compatible

outputs provide all of the critical timing signals in

•

Composite, Horizontal, and Vertical Sync

CMOS logic, which swing from rail-to-rail (VCC and

Outputs

GND) including Composite, Horizontal, and Vertical

Syncs, Burst/Back Porch Timing, Odd/Even Field,

•

Burst/Back Porch Timing, Odd/Even Field, and

and Video Format Outputs. HSync features very low

Video Format Outputs

jitter on its leading (falling) edge, minimizing external

•

Superior Jitter Performance on Leading Edge

circuitry

needed

to

clean

and

reduce

jitter

in

of HSync

subsequent clock generation stages.

•

Automatic Video Format Detection

The LMH1981 automatically detects the input video

•

50% Sync Slicing for Video Inputs from 0.5 VPP

format, eliminating the need for programming using a

to 2 VPP

microcontroller, and applies precise 50% sync slicing

to ensure accurate sync extraction at OH, even for

•

3.3V to 5V Supply Operation

inputs

with

irregular

amplitude

from

improper

termination or transmission loss. Its unique Video

APPLICATIONS

Format Output conveys the total horizontal line count

•

Broadcast and Professional Video Equipment

per field as an 11-bit binary serial data stream, which

can be decoded by the video system to determine the

•

HDTV/DTV Systems

input video format and enable dynamic adjustment of

•

Genlock Circuits

system parameters, i.e.: color space or scaler

•

Video Capture Devices

conversions. The LMH1981 is available in a 14-pin

•

Set-Top Boxes (STB) & Digital Video

TSSOP package and operates over a temperature

range of

−40°C to +85°C.

Recorders (DVR)

•

Video Displays

Connection Diagram

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.