| 摘要 |
The current addition type D/A converter of the present invention is equipped with a control circuit to reduce power consumption. A control signal is input from a control terminal (17), the resistance value of a resistor (10) that determines a reference current of a current mirror is multiplied n-fold and thereby the operating current of current cell matrix (1) is reduced to (1/n). On the other hand, the resistance value of a current/voltage conversion resistor (16) is multiplied n-fold so as to compensate the reduction of the operating current and maintain a predetermined D/A conversion rate. Normally, there is no input near an upper limit of the input dynamic range, and therefore there is no inconvenience regarding the conversion rate of the D/A converter even if the operating current is reduced.
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