Patent ID: 7746258

Claim:
A digital-analog converter comprising: a plurality of thermometer decoders including a first thermometer decoder for converting upper bits of a digital input signal into thermometer code signals except for the lower bits of the digital input signal, and a second thermometer decoder for converting intermediate bits into thermometer code signals except for the upper bits and the lower bits of the digital input signal; a delay unit for delaying output of the lower bits of the digital input signal; a plurality of latch units including a first latch unit for synchronizing the thermometer code signals of the first thermometer decoder, a second latch unit for synchronizing the thermometer code signals of the second thermometer decoder, and a third latch unit for synchronizing the thermometer code signals of the thermometer decoders with an output code signal of the delay unit; a plurality of current sources including a first current source for converting the thermometer code signals outputted from the first latch unit into an analog signal, a second current source for converting the thermometer code signals outputted from the second latch unit into an analog signal, and a third current source for converting the output code signals outputted from the third latch unit into an analog signal; and a voltage converter to convert the analog signal outputted from the first to third current sources into a voltage level, wherein at least one of the first thermometer decoder and the second thermometer decoder includes a row thermometer decoder and a column thermometer decoder.