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US 7,746,258 B2Granted
Digital-analog converter and camera module having the same
AssigneeLG Innotek Co., Ltd.
InventorCheong Yong Park
Life of this patent
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Abstract
Disclosed are a digital-analog converter and a camera module having the same. The digital-analog converter includes a plurality of decoders for receiving bits of a digital input signal by dividing the bits in a predetermined bit unit except for lower bits of the digital input signal, and decoding the bits into thermometer code signals, a delay unit for delaying output of the lower bits of the digital input signal, a latch unit for synchronizing output signals of the decoders with an output signal of the delay unit, and a current source for converting a digital signal output from the latch unit into an analog signal.
Claims20
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.
4 more elements
A camera module comprising:
- a digital-analog converter;
- and
- a motor driven by an analog signal output from the digital-analog converter,
- wherein the digital-analog converter comprises:
- 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 signals 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.
8 more elements
Dependencies are inferred from the claim text.