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The ADV7181C can only convert YPrPb to RGB (component to RGB) or pass RGB through from the extra three ADC inputs, not CVBS to RGB (composite to RGB).
These features are intended to handle SCART inputs with fast overlays of the RGB input over the CVBS input. The added features such as YPrPb to RGB, RGB to YCbCr conversion and graphic RGB processing were part of the original CP design so they were included in the datasheet specifications.
The ADV7181D is a newer part based on the ADV7181C except for a few extra features like 10 analog inputs and a smaller package
If you truly need CVBS to RGB conversion you might look at the ADV7842.
I bought this chip a couple months ago as a possible alternative to a competitor chip of yours. The competitor chip strictly takes an NTSC Composite (CVBS) input and converts it to YCbCr 4:2:2 so my microcontroller can further process it to a digital RGB format for its own display.
I purchased this chip initially because I thought it can convert an NTSC Composite input directly to DDR-RGB 4:4:4 format output (or so the description and documentation lead me to believe), thus cutting the MCU overhead of having to convert to its usable RGB format.
After spending the better of 2 hours reading the datasheet, manual and other info to create a test circuit, it seems that it may not be possible to convert to DDR-RGB4:4:4 with just an NTSC Composite input. It seems like it also needs 3 Analog RGB inputs as well on the AIN channels.
Am I misunderstanding this or missing some important information?
Also, I'm aware of the newer ADV7181D since the ADV7181C is not recommended for new designs. If the ADV7181C can work out I will be creating my design with the ADV7181C. I was not aware of the newer ADC7181D at my purchase in late October.
Replied off line
If you read "ADV7181C EVALUATION NOTE", in figure2 , it is clearly shown " CP SXGA 1280X1024" are supported in VER.3.0. Why suddenly do it disappear?
Can you find the old vesion VER.3.0 script?
Table 8 in the Manual does not list SXGA resolution. The data sheet only talks about resolutions up to 1024x768@70Hz (XGA70). You might try the XGA script and see if it locks on to SXGA since the pixel clocks are about the same. No guarantee.
The ADV7842 will work for SXGA resolution.