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Video Conversion ICs
  AL251 Video Scan Doubler (EOL)
Functional Description

The AL251 Video Scan Doubler (De-Interlacer) is a video conversion chip for LCD VGA display or video editing applications. It converts interlaced NTSC or PAL, ITU-R BT 601 (CCIR601) or Square pixel, YUV422 or RGB 565 digital data into non-interlaced analog RGB signals for direct connection to a computer monitor or progressive scan TV, or digital RGB565/ YUV422 output for LCD monitors, projectors, or other applications.


  • LCD Monitor w/TV Input
  • LCD Projector
  • Video Editing Equipment


Additional Information

AL251 Brochure
AL251 Flyer
Reference Kits
AL251A-EVB-A0 ( Video and VGA Scan Converter)
Replacement Chip
AL360A (Full HD Video Conversion SOC)



  • Convert interlaced digital YUV/RGB (NTSC/PAL) into non-interlaced YUV/RGB format for LCD monitors or video processing
  • High integrated design with built-in DAC, SRAM, OSD and LUT
  • Built-in on-screen-display with programmable bitmap
  • Advanced digital line interpolation with no tearing or jagged edge artifacts
  • Reduced interlace flicker
  • Auto NTSC/ PAL detect
  • Digital video input of square pixel, ITU-R BT 601 (CCIR 601), or user-defined format
  • Analog/ digital non-interlaced RGB (VGA) output (Scan Doubled or De-interlaced) or digital YUV output
  • IIC programming interface
  • Internal RGB video lookup table (LUT) to provide gamma correction
  • Overlay support for title making and complex on-screen display
  • Self-initialization without software (Plug & Play)
  • 3.3 or 5 volt support
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