AC voltage measurement
If you look at an oscilloscope presentation of the AC line, you see a pretty clear sine wave with little noise on it.
Yes, it uses large caps to pass the 60 HZ faithfully (0.1 uF). I have used it in several microprocessor circuits and works as expected.
If you have ever tried to transformer couple AC voltage, you will find the voltage waveform bears little resemblance to the incoming waveform.
I used Xfmr step down for a product before i came up with this IC approach. Product went out, sold a bunch and worked, but I always had this nagging that the waveform was not what i wanted.
The circuit is yours for the asking, free is good!
Larry