AL250 International Power Sources, Inc., AL250 Datasheet - Page 4

• Manufacturer Part Number: AL250
• Description: Video Scan Doubler
• Manufacturer: International Power Sources, Inc.

AL250
3.0 General Description
The AL250/251 Video Scan Doubler (De-Interlacer) is a video conversion chip for consumer video
and multimedia applications. It converts interlaced NTSC or PAL, ITU-RBT 601 (CCIR 601) or
square pixel, YUV422 or RGB565 digital signals into computer monitor RGB signals for direct
connection to a computer monitor or progressive scan TV.
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By using I
C interface control, the AL250/251 can also be programmed to co-ordinate with various
input resolutions, adjust screen positioning and crop video noise from around the original input video
boundary.
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The internal RGB video lookup tables (LUT), which are controlled via I
C interface, can provide
gamma correction for calibrating the color accuracy of different types of CRT’s and improving the
contrast level to display more vivid pictures.
A built-in on-screen-display (OSD) provides programmable bitmap RAM for custom design icons
and on-screen control panels.
Overlay function is supported to create titling or on-screen-display menus for video adjustment.
The AL251 provides all the features of the AL250. Additionally, it has digital output in YUV422 or
RGB565
format, and can convert NTSC video for VGA LCD
panels.
The AverLogic proprietary digital signal processing technology creates a highly stable video image
without tearing effects or jagged edges. The output picture is smoother and has less flicker than the
original input signal/picture.
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July 28, 1999