This chip is not plug and play. You need to decide how it is supposed to work (various modes at page 18 of the datasheet), meaning you have to setup the configuration register and then try to work with the converter.

The device code is 1101 (factory set) and you have to blend it with the address pins A0,A1,A2 in the address byte, the first byte sent to the chip (page 19-21). I would tie the A0 and A1 to ground and have an address of 000 combined with the 1101, that is 1101000. This will be the first byte in the I2C command. But you have to do the config first.

Ioannis