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The 3DS joystick works very similarly to any other joystick. It has X and Y axis outputs that work like potentiometers. RDC's converter mostly changes the range and the deadzone so they work better. The pinout is in the top right of this picture (don't pay attention to the other stuff in the picture): http://i.imgur.com/D8BiPjX.jpg.

Can I give more than one like?
That helps a lot. I still have some questions:
- do you know the voltage range of the stick?
- Are the resistors necessary and why do they differ for for X & Y
- What connector would I need to connect a standard 3ds stick to a custom pcb?
Thank you for your help.

Edit: Forgot to ask if you know the compatible voltages for V+. Is 3.3v fine?

Well like I said, you probably shouldn't follow the stuff in that picture. It doesn't work very well if you connect it with resistors.

If you input 3.3V, the voltage outputs on X and Y will be about 2.9V max and about 0.5V min.

You can solder wires to the joystick if you cut off the plastic lip and remove the FFC. If you want to keep the FFC on, you can use a 4-pin 0.5mm pitch FFC connector to connect it to a PCB.