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Video Decoder and ADC ICs
  AL242 Adaptive 2D Comb-Filter Video Decoder (EOL)
Functional Description

The AL242 is silicon efficient, cost effective high quality NTSC/PAL/SECAM video decoder with 2D-Comb filter adapted Y/C separation process. The AL242 decodes NTSC/PAL/SECAM composite video, S-video or component video and converts it into YCbCr 4:2:2, 8-bti/16-bit or YCbCr 4:4:4, 22-bit digital video. Employing adaptive 2D comb filter technology, the AL242 is able to provide the high quality Y/C separation while maintaining excellent frequency response. The result is sharp, high detail video that eliminates unwanted dot crawl and false color effects. Fully programmable video characteristic controls, such as hue, contrast, brightness, saturation, are supported. The AL242 decoder incorporates an advanced vertical blanking interval (VBI) data processor to do data slicing, parsing and decoding teletext, closed caption, and other formats.
Additional Information
AL242 Brochure
Reference Kit:
AL242C-EVB-A1 (2D Comb Filter Video Decoder EVB)
Replacement Chip:
AL244C-LF2-PBF  (4-in-1 Comb-Filter Video Decoder)



  • Decodes NTSC, PAL and SECAM composite video, S-video or Component video
  • Supports all variation of the NTSC and PAL standard-I, B, G, H, D, N, M, combination N
  • Standard 8-bit ITU 656 16-bit ITU601 along with separate sync signals YCbCr 4:2:2 or 22-bit YCbCr format output
  • Excellent quality Y/C separation-minimizes cross luma and cross color effects
  • Auto detects and locks VCR trick modes
  • Decodes weak and noisy off-air signals
  • Fast lock on channel switching
  • Auto detects and decodes Macrovision copy protection, etc.


  • Image Processing System
  • Format Converter System
  • Video Editing
  • Video Capture Devices
  • Set top Box Decoders
  • Mobile Systems
  • Handheld Applications
  • Video Surveillance System
  • Personal or Digital Video Recorder
  • Video Phone
  • Networking Video
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