External PWM IC for arduino

[johnerrington]

@KOR

am looking for an IC which I can easily interface with the arduino to get a PWM (rectangle) signal with variable frequency and duty cycle.
preferable 1 Hz to 20 MHz and a duty cycle which can be changed by 0.1%
I will manage if the frequency range is lower but I need at leat 1khz to 5 Mhz frequency steps preferable in 1Hz increments or less.
In a perfect world the output voltage of the signal would be 5V.

Perhaps its time to tell us exactly what you re trying to achieve, rather then how you hope to do it?