Minimum ADC Sample Times

[JKing.3]

Looking at the datasheet for STM32F20xxx ADC; if I run the ADC at 30MHz and use the minimum sample time of 3 (100ns), the input sample capacitor will not be fully charged even with zero source resistance. The input spec is 6K and 4pF, if you take the minimum sample time of 100ns, this represents 4.17 time constants, i.e. 98.4% charged - is this error correct when running at full speed?

Thanks

Julian