What is the ARM 32 bit MCU with the fastest ADC?
As said in this recent question : Is there any micro-controller with ADC &gt; 20 MSPS?


NXP LPC4370 goes up to 80 MSPS @ 12 bits : http://www.nxp.com/products/microcontrollers/cortex_m4/LPC4370FET100.html


Check out NXP site to find other LPC references with high speed ADC (but 80 MSPS seems to be the highest).