Q1: is AD9375 pin compatible with AD9371?ie if one's design uses AD9371, he still can use AD9375?
Q2: Considering the JESD interfaces, does one needs maximum of 2x lanes for TX and 2x lanes for RX only using AD9375?
Q1. Yes they are pin compatible. You can replace AD9375 in AD9371 custom designed board.
Q2. Number of Lanes depends on the datarate and number of lanes supported by your BBP. For AD9375 , there is no additional requirement of JESD lanes because of DPD.
Please refer UG-992 , equation (1) (Page 19, User Guide Rev 0) for relation between number of lanes and datarate.
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