1. Application circuit diagram:
2. RE radiation (only switching power supply operates, source end disconnected uCLK)
3、RE辐射（开关电源工作同时AMC1305F25DWR工作，CLK时钟频率20MHz）
4. RE radiation (connected to peripheral cables, under normal operating conditions) exceeds the limit value
frequency of 20MHz. According to the points calibrated in Figure 3, it can be seen that the high-energy spectrum has an equal spacing of 10MHz. In addition, we removed the external cable, turned off the AMC1305 clock, and only kept the switching power supply working. The background spectrum was measured to be relatively clean. Then, we restored the AMC1305 clock to start working sampling, and found that the high-energy 10MHz spectrum had already been generated. We hope to obtain a relatively effective solution without affecting signal quality. We can provide PCB layout suggestions and make changes accordingly.
