Patent ID: 7701373

Claim:
A current steering DAC having a plurality of channels and including in each channel a plurality of unit current sources corresponding to a number of bits of a digital input signal, for, in each channel, selecting the plurality of unit current sources according to a value of the digital input signal and outputting a sum of currents of the selected unit current sources from an analog output terminal, the current steering DAC comprising: a bias circuit shared by the plurality of channels, for generating a bias voltage for setting a current value of the plurality of unit current sources, wherein in at least one of the plurality of channels, each of the plurality of unit current sources is formed by a plurality of divided current sources and the current steering DAC comprises: a plurality of cascode portions respectively corresponding to the divided current sources; and a control circuit for controlling the cascode portions so as to turn off at least one of the plurality of divided current sources in each unit current source.