LM1881_06 Datasheet

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LM1881 Video Sync Separator

May 2006

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.

Features

n

n

n

n

n

n

n

n

n

AC coupled composite input signal

>

10 k鈩?input resistance

<

10 mA power supply drain current

Composite sync and vertical outputs

Odd/even field output

Burst gate/back porch output

Horizontal scan rates to 150 kHz

Edge triggered vertical output

Default triggered vertical output for non-standard video

signal (video games-home computers)

Connection Diagram

LM1881N

00915001

Order Number LM1881M or LM1881N (0藲C to +70藲C)

See NS Package Number M08A or N08E

*PAL in this datasheet refers to European broadcast TV standard 鈥淧hase Alternating Line鈥? and not to Programmable Array Logic.

漏 2006 National Semiconductor Corporation

DS009150

www.national.com

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