Extension circuit  for AD7747


I am using AD7747 IC for capacitance measurement. I have seen the circuit using opamp for extending the range of AD7745/46 IC. Can same be applied for AD7747? If yes, What will be the new range for the circuit of AD7747 with extension circuit. How does this circuit actually works?

  • 0
    •  Analog Employees 
    on Aug 18, 2015 5:04 PM

    Hi Chaitree,

    The range extension work was only done with the AD7745/46 IC so I have no data nor what if anything can be done with the AD7747.  The two excitation sources of the AD7745/46 were used to achieve a reduction in the excitation voltage through resistors and the mean of which remained around Vdd/2 .



  • 0
    •  Analog Employees 
    on Aug 2, 2018 3:09 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