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ADS7040: What is the state of the SDO pin when the chis is not selected (CS# is high)

Part Number: ADS7040

I'd like to string together multiple of these devices, sharing the CLK and SDO lines between 3 devices and only having a unique CS# line per device, but I don't see any definition for the state of the SDO pin when not selected.  I assume it goes into a high impedance state with some kind of weak pull up?  Is this defined?