| 摘要 |
An analog-to-digital converter includes a sample and hold circuit for sampling and holding an input analog signal and outputting an analog voltage, a selection code generator for generating a selection code corresponding to an operation mode for a number of conversion bits and a number of samples, a decoder for generating an enable signal corresponding to the selection code, a comparator for comparing an external voltage with the analog voltage and outputting a digital value, a conversion data register for storing the digital value and outputting a final digital value, a digital-to-analog converter for outputting the external voltage by inputting the digital value and a reference voltage stored in the ADR, a multiplexer for selecting a signal path for the operation mode selected by the selection code generator, a shift register for determining a number of registers for the operation mode selected by the selection code generator, a counter for counting a number of shifts of the shift register and determining the signal path of the multiplexer, an output detector for detecting a conversion value of a lowest bit of the conversion data register and outputting a conversion end signal to the conversion data register, and a controller for controlling operation of the A/D converter by outputting a clock signal in response to the selection code and the conversion end signal.
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