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Introduction
This AL240 Evaluation Kit is specially designed
for evaluating the AL240 Adaptive Low Power
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.
The most recent version provides Binary Switch,
Fast Channel Switch, Close Caption VBI detect
and display.
AL240
Adaptive Low Power Video Decoder
The AL240 is a silicon efficient, cost effective
high video quality NTSC/PAL
SECAM video decoder with high quality Y/C separation
process. The AL240 decodes NTSC/PAL SECAM composite
video or S-video and converts it into YUV 4:2:2,
8-bit ITU 656 digital video output. Employing
adaptive filter technology, the AL240 is able
to provide clear Y/C separated signals 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, saturation,
are supported. The AL240 decoder incorporates
an advanced vertical blanking interval (VBI)
data processor to do data slicing, parsing and
decoding teltext, closed caption, and other
formats. 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
AL240 chips on the design without extra logic.
Applications for the AL240C chipset
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Video surveillance applications
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Mobile System
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Handheld Applications
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Video Capture devices
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Video Phone
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Networking Video, etc.
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Features
- Decodes
NTSC, PAL and SECAM composite video or S-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)
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4 analog inputs with internal switches among
four input - e.g. 4xCVBS, 2xS-Video or
(2xCVBS & 1xS-Video)
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Standard 8-bit ITU-R.BT656 along with separate
sync signals, YCbCr 4:2:2 format output
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Excellent quality Y/C separation – minimizes
cross Luma and cross color effects
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Adaptive Comb Filter for NTSC&PAL Y/C
separation
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BCS (Brightness/Contrast/Saturation and Hue)
control
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Supports VBI decoding
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Decodes weak and noisy off-air signals
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Hardware channel switching
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Two-wire serial bus programming with up to
4 serial bus sub-addresses selectable
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