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上海元件五厂生产的5G14433 A/D转换器具有低功耗、高输入阻抗、抗共模干扰能力强、转换精度高、外接元件少、价格低廉、使用方便等优点,但该器件由于受内部电路或管脚封装的限制,无转换启停控制端,一旦上电,它将不停地转换。而众多的应用场合,尤其是与微机配接时,常常要求模数转换器的转换启停时间受控。本文介绍了一种方法,通过切换现有芯片某些引脚的信号,便可使5G14433满足上述要求,且这种方法实现非常简便。笔者在某实际应用系统中采用这一方法,收到了良好的效果。
The 5G14433 A / D converter produced by Shanghai No.5 Factory has the advantages of low power consumption, high input impedance, strong anti-common mode interference, high conversion accuracy, low external components, low price and easy to use. However, Circuit or pin package limitations, no conversion start and stop control side, once the power, it will continue to convert. And many applications, especially with the computer mate, often require the ADC converter start-stop time controlled. This article describes a method that allows the 5G14433 to meet the above requirements by switching the signals of some pins of an existing chip, and this method is very easy to implement. I use this method in a practical application system, received good results.