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AFE7906: Unused lanes

Part Number: AFE7906

Tool/software:

Hi Texas, 

We're building up our schematic using AFE7906 and as we are planning on using JESD204B mode 1-8-16-1-0 not all TX-/+ pins seems to be used, just 1 lane (differential pair) would be necessary, right?

Should we leave the rest of the TX+/- pins floating, pull down/up...? Any recommendations?

Many thanks!

Anna