The PIC or AVR itself runs from a maximum of ~5 V, so this is not directly possible.

One way to do it might be to use the PWM output, and put it in to an RC low-pass filter. This is usually the best way to improvise a low-speed DAC with the hardware available on a typical micro.

If the micro is running at 5 V, then this produces a DC voltage between 0 and 5 V, according to the PWM duty cycle. If the PWM frequency is 10 kHz, then you might choose R = 33k, C = 10 uF; that would give RC = 330 ms. Faster time constants give faster response time, but more ripple.

Then you can use a higher-voltage opamp to amplify the signal with gain +2 V/V. That will also buffer the signal, so that it doesn't get loaded down by whatever you're driving. Something like an LM324, configured as a non-inverting amplifier and running from +12 V (since it can swing up to V+ - 1.5 V) might do the job, depending on the impedance of your load.

Please show my an schematic example.
Thank you

Es posible adicionar mas de una salida analogica?, puedes poner un ejemplo con 3 salidas analogicas?