Dear fellow freaks,
I'm currently designing a new project based on the ATxmega128A1. Since it's a new processor I'm uncertain what clock source to use. What are your experiences?
My basic needs are:
- Good temperature stability. Outdoor product that will go from very cold to quite hot. No more than 2-3% error is allowed.
- Speed speed speed. Lots of processing to be done, the faster the better.
Older ATmega1280 projects I've done with 14.7 MHz crystal for temperature stability. Now that the new xmega can go all the way to 32 MHz is very tempting to switch to internal oscillator. It's specified to 1% accuracy for the full temperature range. But when asking Atmel representatives about real tests and not only specifications none have been done.
So what are your experiences is the internal oscillator stable?
Or would an external oscillator 16 MHz with PLL x2 be a better path?
All feedback very welcome!