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?
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 .