Like @ruilviana says, AD9833 uses SPI, not I2C interface. If you have free Arduino pins, it may be easiest to simply manage two AD9833 boards with different pins - for example, one with hardware SPI and the other with software SPI.
Like @ruilviana says, AD9833 uses SPI, not I2C interface. If you have free Arduino pins, it may be easiest to simply manage two AD9833 boards with different pins - for example, one with hardware SPI and the other with software SPI.