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REF5025: output only 2.2V~2.3V following basic connections

Part Number: REF5025
Other Parts Discussed in Thread: REF5020

Hi Team,

customer has two board one hand each with two REF5025 on it.

following the schematic connection

with input at 3.5V, the output of the REF5025 is only 2.2V ~2.3V and not 2.5V (happens on all 4 REF5025)

on the same board, replace with ADR03, it can output 2.5V

also there are REF5020 on the same board, and it outputs 2.048V.

we're applying a board to check the REF5025 IC, but project timeline is short and would like to check if any comments or suggestions from the design team?