AL128 データシートの表示（PDF） - Unspecified

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AL128

Plug and Play VGA to NTSC/PAL Converter

Unspecified 

2.0 Applications

PC ready multimedia TV

TV output for laptop, network, entertainment PC

Net browser/set-top box

Internet TV

VGA add-on card with TV output

VGA to TV converter box

AL128

3.0 General Description

The AL128 PC to TV scan converter chip

accepts graphic data up to 1024x768

resolution from PC and Macintosh graphics

controllers and converts it into broadcast-

quality NTSC or PAL TV signals. In addition

to analog RGB, 24-bit digital RGB data can

be input to maintain the best video quality and

avoid noise problems. This new chip is pin-to-

pin compatible with the AverLogic AL100 but

provides analog RGB output for SCART

implementation.

An integrated high-quality anti-flicker filter

(SmartFilter™ ) removes the unpleasant

flicker caused by the interlaced display of high

contrast graphics while maintaining the

original clarity and sharpness of informative

data such as natural pictures and text.

With 512Kbytes of memory, plug-and-play is

achieved by automatically detecting the scan

rate and resolution of the incoming graphic

signals without the use of software. With less

memory than other solutions on the market,

high resolution data is processed and stored by

using a complex and proprietary buffer

management system. No compromise is made

at all with video quality by using either

compression or sub-sampling algorithms.

The major functions of the AL128 can be

accessed using four push buttons combined

with the on-screen-menu feature, eliminating

the cost of a micro-controller and complex

control panel. The superior quality scaling

algorithm, which reduces the jagged-edge

artifacts from line dropping, can smoothly fit

graphics of 640x480 (up to 100 Hz) and

1024x768 (up to 75Hz) resolutions into the

visible region of the NTSC or PAL screen.

Both horizontal and vertical sizes can be

linearly adjusted. Additional features include

eight levels of flicker control using 5-line

filter, zoom control and picture freeze.

This highly integrated mix-signal chip,

packaged in 24mm x 24mm 160-pin LQFP

(low quad flat package), is powered by a

single 5-volt power supply. Power-down is

achieved by using either hardware or software

control.

The enhanced features and superior quality

make the AL128 very suitable for PC video to

TV conversion in PC ready multimedia TV’s,

scan converter boxes, VGA add-on cards,

Web TVs, or network / laptop PCs.

April 2, 1999

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