I am using AD736 to measure rms value of dc currents. The circuit is simulated in PSpice. The problem is that the output voltage is always fixed on 1.08V in the input range of 10mV~4V. However if I measure the voltage on C3, the voltage is the correct rms value even in the case of ac input.
But according to datasheet, the output voltage reference should be the COM pin. Can anyone explain why the AD736 is behaving like this please? Thanks.