pic mcu to drive analog input

I have an AX2850 that I would like to drive in speed mode using a Picaxe 18x 0 to 5volt PWM output .Will this require some sort of lowpass filter or will the AX2850 accept this signal directly.

If your PWM out is a 0% to 100% duty cycle type, you should use an RC filter to convert it to a voltage and use the controller in analog mode.

If you have access to your PIC's timer, you could also program it to output RC-style pulses (1ms full reverse, 1.5ms stop, 2.0ms full forward). The controller would need to be configured in RC mode.