Advantech AIMB-250 User Manual

22 AIMB-250 Series User’s Manual 
 

 

The Chrontel CH7009A is a display controller device which accepts a digital graphics input 
signal, and encodes and transmits data through a DVI (DFP can also be supported) or TV 
output (analog composite, s-video or RGB). The device accepts data over one 12-bit wide 
variable voltage data port which supports five different data formats including RGB and 
YCrCb. 
The DVI processor includes a low jitter PLL for generation of the high frequency serialized 
clock, and all circuitries are required to encode, serialize and transmit data. The CH7009 
comes in versions able to drive a DVI display at a pixel rate of up to 165MHz, supporting 
UXGA resolution displays. No scaling of input data is performed on the data output to the 
DVI device. 
The TV-Out processor performs non-interlace to interlace conversion with scaling and 
flicker filters, and encode the data into any of the NTSC or PAL video standards. The 
scaling and flicker filter is adaptive and programmable to enable superior text display. 
Eight graphics resolutions are supported up to 1024 by 768 with full vertical and horizontal 
underscan capability in all modes. A high accuracy low jitter phase locked loop is 
integrated to create outstanding video quality. Support is provided for Macrovision

TM

 and 

RGB bypass mode which enables driving a VGA CRT with the input data.