I'm reading the datasheet for the HCPL3700M AC/DC to Logic Interface Optocoupler. In a test circuit diagram, it shows a pulse generator connected to both the AC and DC pins (see attached).
- Why would it need to go to both?
- Why is the pulse connected to the ground on the logic side? Is the purpose not to keep higher voltage AC separated from the logic side?
The datasheet can be found here: https://www.mouser.com/datasheet/2/308/HCPL3700M-1306568.pdf