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一、引言用Z-80 CPU的单板机或微机系统,在实时控制、分时控制、智能仪器仪表的应用方面占有较大的比例。为达到控制和测量外界模拟量的目的,必须进行A/D模数转换。目前常见的A/D转换器件是ADC0808和ADC0809,从各种资料及厂家生产的A/D卡来看,均采用图1所示的电路。
I. INTRODUCTION The single board computer or microcomputer system with Z-80 CPU occupies a large proportion in the application of real time control, time sharing control and intelligent instrumentation. For the purpose of controlling and measuring the external analogue, A / D analog-digital conversion is necessary. The current common A / D converter devices are ADC0808 and ADC0809, from a variety of information and manufacturers A / D card point of view, are used in Figure 1 shows the circuit.