Why the internal REF of AD4112 outputs lower than 2.5V?

HI, 

I'm using the AD4112 with internal REF enable(no external REF+/-). When I check the REF's output, I found it's 2.22V or 2.17V or some value lower than 2.5V. And the ADC result also bigger than the value from the signal generator. Does anyone meet this situation? 

My circuit graphic is this. Have I missed something?

Thanks very much!

DS LI

  • 0
    •  Analog Employees 
    on Jun 10, 2020 12:12 PM

    Hi,

    I'm not sure if it is only in the schematic, but I do not see any supply voltage on AVDD.

    If you can check the voltage at AVDD to confirm that you have a valid supply then that would be great.

    I would say, it shouldn't be that far from 2.5V value, so maybe there could be something in your setup that causes this issue. If you can check again your connections, that would be worth confirming.

    Thanks,

    Jellenie