LMH1981MT National Semiconductor Corporation, LMH1981MT Datasheet
LMH1981MT
Manufacturer Part Number
LMH1981MT
Description
Manufacturer
National Semiconductor Corporation
Datasheet
1.LMH1981MT.pdf
(13 pages)
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© 2006 National Semiconductor Corporation
LMH1981
Multi-Format Video Sync Separator
General Description
The LMH1981 is a high performance multi-format sync sepa-
rator 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, 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 microcontrol-
ler, and applies precise 50% sync slicing to ensure accurate
sync extraction at O
tude 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 op-
erates over a temperature range of −40˚C to +85˚C.
Connection Diagram
Ordering Information
14-Pin TSSOP
Package
FIGURE 1. Pinout
H
, even for inputs with irregular ampli-
14-Pin TSSOP
Top View
LMH1981MTX
Part Number
LMH1981MT
DS201745
20174501
Package Marking
LMH1981MT
Features
n Standard analog video sync separation for NTSC, PAL,
n Bi-level & tri-level sync compatible
n Composite, Horizontal, and Vertical Sync Outputs
n Burst/Back Porch Timing, Odd/Even Field, and Video
n Superior jitter performance on leading edge of HSync
n Automatic video format detection
n 50% sync slicing for video inputs from 0.5 V
n Macrovision compatible
n 3.3V to 5V supply operation
Applications
n Broadcast and Professional Video Equipment
n HDTV/DTV Systems
n Genlock Circuits
n Video Capture Devices
n Set-Top Boxes (STB) & Digital Video Recorders (DVR)
n Video Displays
Pin Descriptions
Pin No.
1
2, 5, 10
3, 6, 11
4
7
8
9
12
13
14
SECAM, 480I/P, 576I/P, 720P, and 1080I/P/PsF from
Composite Video (CVBS), S-Video (Y/C), and
Component Video (YP
Format Outputs
2.5k Units Tape and Reel
Pin Name
R
GND
V
V
HSOUT
VSOUT
VFOUT
CSOUT
BPOUT
OEOUT
Transport Media
CC
IN
EXT
94 Units/Rail
B
Pin Description
Bias Current External Resistor
Ground
Supply Voltage
Video Input
Horizontal Sync Output
Vertical Sync Output
Video Format Output
Composite Sync Output
Burst/Back Porch Timing Output
Odd/Even Field Output
P
R
/GBR) interfaces
PRELIMINARY
NSC Drawing
MTC14
www.national.com
PP
August 2006
to 2 V
PP
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