Sorry, I commited a mistake in DAC number. It's a AD9742. I'm writing down my own verilog code, but I'm not so expert on analog circuits.
Thanks all for your help, on advance
As Optikon said, if you need help, you'll have to show what you've done. It really isn't sufficient showing an ebay link of a device similar to what your are developing.
Please post your schematic, if you need help.