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二、D/A转换电路及其与微处理器接口1.D/A转换电路原理D/A转换电路有多种形式。在集成电路中,一般采用T形电阻解码网络(见图2-1)。在T型解码网络中,有一标准电源-V_(REF),二进制数的每一位对应一个电阻及由该位代码所控制的双向开关。图2-1示出了3位二进制数的数/模转换电路。数字量位数增加或减少时,电阻及开关相应增加或减少。
Second, D / A conversion circuit and its interface with the microprocessor 1. D / A conversion circuit principle D / A conversion circuit has many forms. In the integrated circuit, the general use of T-resistance decoding network (see Figure 2-1). In the T-decoding network, there is a standard power supply - V_ (REF), each bit of the binary number corresponds to a resistor and the bidirectional switch controlled by this bit code. Figure 2-1 shows a 3-bit binary digital / analog conversion circuit. As the number of digits increases or decreases, the resistance and switch increase or decrease accordingly.