| 摘要 |
A digital to analog converter is provided to improve an automatic focus function of a camera by precisely controlling a voice coil motor with an open-loop manner by improving linearity. A digital to analog converter includes a first thermometer decoder(110) decoding most significant bits among inputted digital signals to a thermometer code signal. A delaying unit(130) outputs after delaying least significant bits among inputted digital signals for a predetermined time. A second thermometer decoder(120) decodes middle bits among inputted digital signals to a thermometer code signal. A latch unit(140) synchronizes signals inputted from the first thermometer decoder, the first thermometer decoder, and the delaying unit. A current source(150) converts a digital signal outputted from the latch unit to an analog signal. A buffer performs buffering of a signal outputted from the current source. One terminal of a resistance is connected to an input terminal of the buffer, and the other terminal of the resistance is connected to an input voltage.
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