本实验采用 ADC0809 做 A/D 转换实验。ADC0809 是一种8路模拟输入、8位数字输出的逐次逼近法A/D器件，转换时间约100us，转换精度为±1/512，适用于多路数据采集系统。ADC0809片内有三态输出的数据锁存器，故可以与8088微机总线直接接口。-In this study do ADC0809 A/D conversion experiments. ADC0809 is an 8-channel analog inputs, 8 digital outputs successive approximation A/D devices, the conversion time is about 100us, conversion accuracy of 1/512, suitable for multi-channel data acquisition system. There are three-state output data latch inside ADC0809 chip, it can interface directly with the 8088 microprocessor bus.