using ICL8038 waveform generator IC with arduino uno
The AD9850 is very different from the ICL8038

The AD9850 datasheet describes it as:


  The AD9850 is a highly integrated device that uses advanced DDS
  technology coupled with an internal high speed, high performance D/A
  converter and comparator to form a complete, digitally programmable
  frequency synthesizer and clock generator function.


It is designed to be digitally programmable, for example by a microcontroller (the type of device in an Arduino)

The ICL8038 datasheet describes it as:


  The ICL8038 waveform generator is a monolithic integrated circuit
  capable of producing high accuracy sine, square, triangular, sawtooth
  and pulse waveforms with a minimum of external components.


It is a free-standing device which only requires some resistors and capacitors to make a usable waveform generator. It is not designed to be digitally programmable. 

There are many chips which are not designed to integrate with a microcontroller. The ICL8038 is one of them.

Given enough time and money, it is, of course, theoretically possible to interface an Arduino and ICL8038. However it uses both resistors and capacitors to define its behaviour, and capacitors are quite awkward to do. It might cost more money, and a lot more time to enable the Arduino to talk to ICL8038 than just buying a AD9850.

I'd recommend either use a AD9850, or something very similar which is designed to be digitally programmed.