can DM365's adc be used for touchscreen?

It's difficult to understand what you are asking. Please provide some level of detail.

WELL.

I need a touchscreen LCD in my application. I am asking is :can the ADC(Analog To Digital Converter)  in DM365 be used for touchscreen controller (like S3C2440 or other SOC integrated a touchscreen controller)? 

If it cannot do this, what's its purpose? just do Analog To Digital Convert ?because DM355 and DM644x are also the DAVINCI processor, but they don't have ADC.

that's to say , If it cannot do this , I must connect a ADS7843(or else) to DM365. 

It seems the ADC in DM365 can not do the same thing as TVP7002. I think it can just do the simple things other ADC also can do, like measuring voltage.

Why does not TI integrate a touchscreen controller in DAVINCI? what a pity!!!

The ADC on the DM365 is well-suited for resistor ladder switch configurations frequently used in user interfaces to minimize the number of wires used, such as is used in wired remote controls.

I'm not a DM365 expert, but it seems to me that the ADC would be suitable for touch screen circuits like those found at http://www.circuitcellar.com/library/print/0100/dahlin-114/2.htm.  I think the ultimate question is how much performance do you need from your touchscreen (ie., how fast can it do the conversion and how accurate is it).  You can compare the ADC performance of devices like those at http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=930&uiTemplateId=NODE_STRY_PGE_T with the specifications of the DM365:

6.25 Analog-to-Digital Converter (ADC)
The device has a 6-channel 10-bit Analog-to-Digital Converter (ADC) interface. The analog-to-digital
converter (ADC) feature is very common in embedded systems. The following features are supported on
the Analog-to-Digital Converter (ADC):
• Six configurable analog input selects
• Successive Approximation type 10 bit A-D converter
• Programmable Sampling / Conversion Time (base clock is AUXCLK)
• Channel select by Auto Scan conversion
• Mode select by One-shot mode or Free-run mode
• Programmable setup (idle) period to secure A/D sampling start time
• Supports the clock stop signals to connect the PSC
For Analog-to-Digital Converter characteristics, see Section 5.2 and Section 5.3.

Specs from Section 5.3:
DNL Static differential non-linearity error FSCLK = 2MHz -1 2.5 LSB
INL Static integral non-linearity error FSCLK = 2MHz -3 3 LSB
ZSET Zero scale offset error -6 6 LSB
FSET Full scale offset error -6 6 LSB

Thanks, Jason.  I misunderstood the original question to be about the video ADC on the EVM...not the ADC in the chip.  Sorry for the confusion.

Regards,

Sonia

I don't think It is a proper controller for 4-wire resistor touchscreen.

It lacks a "pen down" interrupt. although we may use a timer to query the pressure , or add some circuit outside.

So, DM365 cannot connect a touchscreen directly.

But i found this wiki: http://processors.wiki.ti.com/index.php/DM365_touchscreen_with_Qt.

I don't have a dm365EVM, and don't know how it works. It seems the LCD connector do the touch things?