Abstract: A D/A converter of the current switching type has a first current mirror circuit that D/A converts the upper (n?m) digits in n bit data to be converted and a weighting current circuit block or a second current mirror circuit that D/A converts the lower m digits in the data, by cascade connecting the weighting current circuit block or the second current mirror circuit at the upstream or at the downstream side of an output side transistor other than the output side transistors of the first current mirror circuit. In this manner, current flowing through the output side transistor flows as diverting currents to the weighting current circuit block or the second current mirror circuit corresponding to the digit weights of the lower m digits, and the diverting currents are taken out at the outputs of the D/A conversion circuit as analog converted currents of the lower m digits.

Abstract: A D/A converter of the current switching type has a first current mirror circuit that D/A converts the upper (n?m) digits in n bit data to be converted and a weighting current circuit block or a second current mirror circuit that D/A converts the lower m digits in the data, by cascade connecting the weighting current circuit block or the second current mirror circuit at the upstream or at the downstream side of an output side transistor other than the output side transistors of the first current mirror circuit. In this manner, current flowing through the output side transistor flows as diverting currents to the weighting current circuit block or the second current mirror circuit corresponding to the digit weights of the lower m digits, and the diverting currents are taken out at the outputs of the D/A conversion circuit as analog converted currents of the lower m digits.

Abstract: A multi-type air conditioner address setting method and address setting device for automatically setting an address with a simple structure. A dummy address sent from an exterior device is stored in an interior device. The interior device determines whether the interior device itself is operating in a designated operation mode. When the interior device is operating in the designated operation mode, the dummy address is set as an actual address. When an address request signal is sent from the exterior device, the set address is sent back thereto.