1. Using the eval-cn0285-eb1z evaluation board2. Adl5375-05 chips IBBP, IBBN, QBBP and QBBN are 1.68v. Is this normal?
Yes, 1.68V at Baseband inputs are normal when Baseband Inputs(IBBP,IBBN,QBBP,QBBN) are open.
It is because even tiny current flow with high impedance at internal circuit sets high voltage. For AD5375-05 case, it is around 1.67V~1.68V. When baseband inputs are connected to DAC or baseband source generator, it should be set by them externally. Please refer to the section " DAC MODULATOR INTERFACING".
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