-1/Vin function with multiplier or divider chip

Hello,

I am trying to design a circuit that has the function -k*1/x. I'm looking into your multiplier ICs, could you help me select the correct IC for this function?  An app note if available would be great too!

My power rails are +/-5V, my input voltage range is from 0.4V to 2V.

Thank you,

Monse