AD9218 reference

have a new set of ADs AD9218 in an updated design.

the reference is measuring 1.31 V (outside the 1.25 V tolerance).   pins 5,6,7 (reference and A & B) are all tied together.  what could cause the reference to go out of tolerance

  • 0
    •  Analog Employees 
    on Mar 27, 2015 9:50 PM

    Hi Joe,

    The AD9218 VREF output is specified for 1.18V to 1.28V @25C using a nominal 3.0V supply. Can you please confirm your VD supply is 3.0V when you are observing the 1.31V VREF output? It might also be useful if I could contact you directly to obtain more details about your application specific AD9218 schematic.

    Best Regards,

    Tony M