ADC sampling Freq

[stranet]

Hi,
I'm trying to develop an application like a little oscilloscope with the
Mini2440 board and WIN CE 5.0 (Open CF dll)

I've readed on the datasheet that the ADC can sample 500Khz I need only
50Khz... but with WInCE 5 I can't read the ADC value with less than 300uS
so I can achieve less then 3Khz.

Do you know how to do?

Thnx a lot.