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AL242C-EVB-A1 - 2D Comb Filter Video Decoder EVB (EOL)



This AL242 Evaluation Kit is specially designed for evaluating the AL242 Adaptive 2D Comb Filter Video Decoder. The evaluation kit allows maximum flexibility for optimizing various input and output modes for
specific applications. Using the hardware and software provided in the Evaluation Kit, Standalone and PC-Based mode can be demonstrated. In addition, there are many new hardware and software functions provided in this edition including Binary Switch, Fast Channel Switch, Close Caption VBI detect and display, Macrovision™ copy–protect signal detect

AL242 Adaptive 2D Comb Filter Video Decoder

The AL242 is a silicon efficient, cost effective high video quality NTSC/PAL/SECAM video decoder with 2D-Comb filtering. The AL242 decodes NTSC/PAL/SECAM composite video, Svideo or component video and converts it into YUV 4:2:2, 8-bit digital video respectively. Employing adaptive 2D comb filter technology, the AL242 is able to provide 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 control, such as hue, contrast, brightness, and 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. The Macrovision™ copy-protect signal is auto-detected and reports to the registers. Two wires of fast channel switching input allow the decoder to do an instant alternation of analog CVBS input from one to the other. Up to 4 serial bus addresses can be selected via 2 configuration pins that allow multiple AL242 chips on the design without extra logic.

Applications for the AL242C chipset

  • Image Processing
  • Format Converter Systems
  • Video Editing
  • Video Capture Devices.
  • Set Top Box Decoders.
  • Mobile Systems
  • Handheld Application
  • Video Surveillance System
  • Personal/Digital Video Recorder
  • Video Phone
  • Networking Video, etc.


Key Features

  • Decodes NTSC, PAL and SECAM composite video, S-video or component video
  • Supports all variations of the NTSC standard – (M, 4.43)
  • Supports all variations of the PAL standard – (I, B, G, H, D, N, M, combination N).
  • 2x 10-bit A/D converters
  • Supports digital automatic gain control (AGC)
  • 4 analog inputs with internal switches among four analog inputs - e.g. 4xCVBS, 2xS-Video, (2xCVBS & 1xS-Video) or 1xYPbPr component
  • Standard 8-bit ITU-R.BT656, 16-bit ITU-R.BT601 along with separate sync signals, YCbCr 4:2:2 or 22-bit YCbCr 4:4:4 interlaced format output (* Please contact AverLogic for 16-bit
    ITU-R.BT601& 22-bit YCbCr 4:4:4 formats support)
  • Line-Locked system clock frequencies.
  • Excellent quality Y/C separation – minimizes cross luma and cross color effects
  • Superior frequency response preserves fine detail
  • Adaptive 2D Comb Filter
    - 3-line 2D Comb filter for NTSC
    - 5-line 2D Comb filter for PAL
  • Software support format detection of video standard (NTSC, PAL or SECAM)
  • BCS (Brightness/Contrast/Saturation and Hue) control
  • Auto detects and locks VCR trick modes
  • Supports VBI decoding
  • Decodes weak and noisy off-air signals
  • Hardware channel switching
  • Auto detects and decodes Macrovision™ copy-protect signal
  • Two-wire serial bus programming with up to 4 serial bus sub-addresses selectable
  • Supports software power down mode
  • 3.3V and 1.8V mix low power supply



AL242C-EVB-A1 User Manual

AL242 chip information