lmh1980mm National Semiconductor Corporation, lmh1980mm Datasheet

lmh1980mm

Manufacturer Part Number

lmh1980mm

Description

Auto-detecting Sd/hd/pc Video Sync Separator

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMH1980MM.pdf (14 pages)

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LMH1980

Auto-Detecting SD/HD/PC Video Sync Separator

General 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 vi-

sion and inspection systems.

The LMH1980 accepts an analog video input signal with ei-

ther bi-level or tri-level sync and automatically detects the

video format, eliminating the need for external R

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.

The LMH1980 is available in a space-saving 10-ld. Mini-SO

Package (MSOP) and operates over a temperature range of

−40°C to +85°C.

Connection Diagram

Ordering Information

10-ld. MSOP

Package

FIGURE 1. Pinout

10-ld. MSOP

Top View

LMH1980MMX

Part Number

LMH1980MM

300103

30010301

SET

Package Marking

resistor

AL4A

Features

■

Applications

■

Pin Descriptions

Pin No.

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 (YP

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 V

3.3V to 5V supply operation

Consumer, Professional, Automotive & Industrial Video

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

3.5k Units Tape and Reel

1k Units Tape and Reel

Pin Name

GND

HSOUT

VSOUT

CSOUT

BPOUT

OEOUT

Transport Media

EXT

/GBR) and PC Graphics (RGsB) interfaces

Pin Description

Bias Current External Resistor

Ground

Supply Voltage

Analog Video Input

HD Detect Flag Output

Horizontal Sync Output

Vertical Sync Output

Composite Sync Output

Burst/Back Porch Timing Output

Odd/Even Field Output

NSC Drawing

MUB10A

www.national.com

July 2007

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