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it is a SPI bus. only in one direction.. if you clock it.. it shifts the data out on the SDO pin.. in spi terms MISO (Master in Slave out.) asuming that your controller is a master.
Connect this pin to your controllers MISO pin an tie the SCL to the clock. You need an extra enable line for the CNV line. On avrs you could probably use the SS line.. but i'm not sure on that.