AD7745 VT SETUP

When I set up Register ,VT SETUP =F1h,result of measurement depends on Δ (REFIN(+)ーREFIN(-))?

Other Register Set up

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CAP SETUP 80h

VT SETUP  :F1h  

EXC SETUP 0Ah

CONFIG  : F9h

CAP A    :E9h

CAP B    :70h

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(A condenser is connected between CIN and EXCA.)

  • 0
    •  Analog Employees 
    on Jan 17, 2018 9:26 AM

    Hi

    the  15pF is read again when the VTSETUP gets back to F1. It means the repeatability seem to be high.

    please measure the VDD for both the setups with an accurate multimeter(6 and ½ multimeter ) and let me know

    thanks

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:00 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin