Hi everyone,
I am playing around with the tm4c1294l board and I noticed something. When at set the system clock to 120mhz using the following command:
ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480), 120000000);
the noise on the 3.3V rail jump from 20mv peak to peak to more than 160mv peak to peak. At this noise level, the adc is completly useless.
Can someone tell me what is causing this problem and how to solve it ...