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406.可编程振荡电路可编程振荡电路如下图所示。它可由外部数字信号直接控制频率。用模拟开关切换电阻来产生不同的振荡频率。获得10Hz分辨力时采用的基准电阻R为:
406. Programmable Oscillator Circuit The programmable oscillator circuit is shown below. It can be directly controlled by an external digital signal frequency. Analog switch to switch resistance to generate different oscillation frequency. When using 10Hz resolution reference resistor R is: