LM1881N National Semiconductor, LM1881N Datasheet

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LM1881N

Manufacturer Part Number
LM1881N
Description
IC, VIDEO SYNC SEPARATOR, 12V, 8-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1881N

Output Synch Type
Composite, Vertical
Supply Voltage Range
5V To 12V
Supply Current
5.5mA
Tv / Video Case Style
DIP
No. Of Pins
8
Operating Temperature Range
0°C To +70°C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2006 National Semiconductor Corporation
LM1881
Video Sync Separator
General Description
The LM1881 Video sync separator extracts timing informa-
tion including composite and vertical sync, burst/back porch
timing, and odd/even field information from standard nega-
tive going sync NTSC, PAL* and SECAM video signals with
amplitude from 0.5V to 2V p-p. The integrated circuit is also
capable of providing sync separation for non-standard,
faster horizontal rate video signals. The vertical output is
produced on the rising edge of the first serration in the
vertical sync period. A default vertical output is produced
after a time delay if the rising edge mentioned above does
not occur within the externally set delay period, such as
might be the case for a non-standard video signal.
Connection Diagram
*PAL in this datasheet refers to European broadcast TV standard “Phase Alternating Line”, and not to Programmable Array Logic.
Order Number LM1881M or LM1881N (0˚C to +70˚C)
DS009150
See NS Package Number M08A or N08E
LM1881N
Features
n AC coupled composite input signal
n
n
n Composite sync and vertical outputs
n Odd/even field output
n Burst gate/back porch output
n Horizontal scan rates to 150 kHz
n Edge triggered vertical output
n Default triggered vertical output for non-standard video
signal (video games-home computers)
>
<
10 kΩ input resistance
10 mA power supply drain current
00915001
www.national.com
May 2006

LM1881N Summary of contents

Page 1

... Connection Diagram Order Number LM1881M or LM1881N (0˚C to +70˚C) *PAL in this datasheet refers to European broadcast TV standard “Phase Alternating Line”, and not to Programmable Array Logic. © 2006 National Semiconductor Corporation ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Output Sink Currents; Pins Output Sink Current; Pin 7 Package Dissipation (Note 2) Electrical Characteristics LM1881 680 kΩ 0˚ ...

Page 3

Electrical Characteristics LM1881 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: ...

Page 4

Typical Performance Characteristics Vertical Pulse Width vs Temperature Application Notes The LM1881 is designed to strip the synchronization signals from composite video sources that are in, or similar to, the N.T.S.C. format. Input signals with positive polarity video (increasing signal ...

Page 5

Application Notes (Continued) ence called V going to one of its inputs. Both comparators 2 have a common input at their noninverting input coming from the internal integrator. The internal integrator is used for integrating the composite sync signal. This ...

Page 6

Application Notes (Continued) FIGURE 1. (a) Composite Video; (b) Composite Sync; (c) Vertical Output Pulse; (d) Odd/Even Field Index; (e) Burst Gate/Back Porch Clamp www.national.com 6 00915003 ...

Page 7

Application Notes (Continued) *Components Optional, See Text ODD/EVEN FIELD PULSE An unusual feature of LM1881 is an output level from Pin 7 that identifies the video field present at the input to the LM1881. This can be useful in frame ...

Page 8

Application Notes (Continued) using a series C-R network. This may be necessary in applications which require high horizontal scan rates in com- bination with normal (60 Hz–120 Hz) vertical scan rates. APPLICATIONS Apart from extracting a composite sync signal free ...

Page 9

Typical Applications FIGURE 3. Video Line Selector 9 00915005 www.national.com ...

Page 10

Typical Applications FIGURE 4. Multiple Contiguous Video Line Selector with Black Level Restoration www.national.com (Continued) 10 00915006 ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted Molded Small Outline Package (M) Order Number LM1881M (0˚C to +70˚C) NS Package Number M08A Molded Dual-In-Line Package (N) Order Number LM1881N (0˚C to +70˚C) NS Package Number N08E 11 www.national.com ...

Page 12

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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