For example, if nothing is connected to the OSC terminal of the J2120A and 5V is applied to the power supply terminal only, it works like a 3.5V output on the output terminal side. Apparently, there is a fixed drop of about 1.5V from the input terminal to the output. So, for example, when I want to apply 0.5V DC, the output side becomes 0V, and I'm having trouble with that. Is this phenomenon a rare occurrence? Could you also tell me what, if any, possible causes are and what measures you can take?