| 摘要 |
The purpose of the present invention is to obtain a high-speed and low-power-consumption analog signal output apparatus without increasing cost and mounting area. An analog signal output apparatus (1) is provided with: two terminals (7a, 7b) that are connected to a load resistor (2); an analog signal output circuit (3); a DC-DC regulator (6); a voltage detection circuit (4) between the two terminals (7a, 7b); and a control circuit (5), which has inputted thereto a detection voltage value (Vr) of the voltage detection circuit (4), and which controls the analog signal output circuit (3) and the DC-DC regulator (6). The control circuit (5) is provided with: a current value setting section (51) that sets a current value to be outputted from the analog signal output circuit (3); a voltage value monitoring section (52) that holds the detection voltage value (Vr); and a load resistance value calculating section (53) that calculates, on the basis of the current value set as the detection voltage value (Vr), a load resistance value (RL), i.e., a resistance value of the load resistor (2). A drive power supply voltage value of the analog signal output circuit (3) is calculated by adding a set voltage margin value to the product of the load resistance value (RL) and a setting upper limit value of an output current of the analog signal output circuit (3). |
