ADRV9026 JESD ORx Data Source Select

There are 4 ORX RF channels and only 2 baseband channels with in the Chip. This means ORX1/ORX2 data is being fed to ORX1 BB channel and ORX3/ORX4 data is being fed to ORX2 BB data.

Thanks!
What is the default source for ORX1 BB and ORX2 BB？What should I do if I want to change the ORX  BB source from one ORx RF channel to another ORx RF channel？

You can select which ORX path you want to use. For eg, ORX in API mode, you can enable just ORX1 as per the below enums here.

What if both ORx1 and ORx2 RF channel be enabled? Which data will be fed to ORX1 BB channel in this case?

As ORX1 and ORX2 RF channel are multiplexed inside the Chip onto a single ORX BB channel, you cant get both channels data at the same, Same applies to ORX3 and ORX4 as well.