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6ES7317-2EK13-0AB0 CPU317-2 PN/DP系统对接收到的超声波信号进行调理和高速采样。如图7所示，内部包含可编程增益放大器（PGA）、12Bit Sigma-Delta ADC， 数据传输控制器（DTC）等功能模块。ADC可以支持高于1.5MHz的信号带，典型信噪比（SNR）可到达63dB。ADC的调制频率从68MHz到80MHz，调制频率来自高速锁相环，可支持过采样率范围10~160。ADC这个功能模块可以独立使用采样其他信号。ADC的大输入范围是600mV，但是在实际流量测试过程中，接受到的超声波信号可能在一个范围内波动。这需要PGA对信号进行调理，使ADC的输入幅值在优采样范围。PGA的增益可以通过寄存器设置动态调整，可调整范围在-6dB~30dB之间，可调步长为~1dB。这一特点可以让我们动态优化产品性能。比如，当换能器长时间使用老化后，发射的超声波幅值降低。在接收端观察到ADC采样幅值降低后，可以通过程序自动增加PGA的增益，使ADC的输入幅值始终保持在优采样范围从而避免设备老化引起系统性能变差。

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