The first selected element selects two voltage references from the first group of voltage references according to m most significant bits of the N-bit digital signal.
第一选择单元依据N位数字信号的M个最高位，由第一组参考电压中选择出两参考电压。
The second selected element selects one of the second groups of voltage references as an output analog voltage according to N-M least significant bits of the N-bit digital signal.
第 二选择单元依据N位数字信号的N-M个最低位，选择第二组参考电压之一作为输出模拟电压。
The second selected element selects one of the second groups of voltage references as an output analog voltage according to N-M least significant bits of the N-bit digital signal.
第 二选择单元依据N位数字信号的N-M个最低位，选择第二组参考电压之一作为输出模拟电压。
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