Patent attributes
An integrated circuit is provided with a power supply terminal and an external circuit connecting terminal which is DC insulated from an internal high-frequency circuit and is connected to an external circuit. An interface is provided with an address identifying circuit having applied with an address identifying voltage corresponding to address data and for setting the interface to receive only channel selection data by the address identifying voltage. The address identifying circuit is connected to the external circuit connecting terminals, and a first resistor is connected between the power supply terminal and the external circuit connecting terminal. The external circuit connecting terminal is DC shorted to the ground, a second resistor is connected between the external circuit connecting terminal and the ground, or the external circuit connecting terminal is DC insulated from the ground.
