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用价廉的通用集成电路组成一个适用的A/D转换电路(见图)。其中OP_1——F_1、OP_2——F_2、OP_3——F_3、OP_4——F_4分别组成四个反相比较器(OP——运放,F——非门),比较器的负端比较电压恒为(1/2)V_(DD)。由于各比较器间所接的分压电阻的作用,使比较器逐级影响,因而逐级改变了各端V_1、V_2、V_3、V_4为A/D转换后的反码,必须注意。根据节点电压法,各比较器被比较端的输入电平为:
With a cost-effective general-purpose integrated circuit composed of a suitable A / D converter circuit (see figure). OP_1 - F_1, OP_2 - F_2, OP_3 - F_3 and OP_4 - F_4 form four inverting comparators (OP - op amp, F - NOT) respectively. The comparator negative voltage compare constant Is (1/2) V_ (DD). Due to the role of the divider resistors connected between the comparators, so that the comparator step by step, so step by step changes in each terminal V_1, V_2, V_3, V_4 A / D conversion of the inverted code, we must pay attention. According to the nodal voltage method, each comparator is compared the input level of the end is: