How to eliminate mutual interference from multiple sampling in power FTU?

Multi-channel sampling interference cancellation employs an independent channel design. Each sampling channel uses an independent ADC chip or ADC channel, such as the ADS8568. An RC filter (1kΩ + 100nF) is added before each analog switch. PCB layout: each sampling input is isolated, with a spacing greater than 10mm and a ground guard ring in between. A separate LDO power supply, such as the TPS7A4701, is used. Software employs time-division sampling with an interval greater than 10μs. This design achieves crosstalk between channels less than -80dB, independent sampling accuracy, and meets the multi-channel simultaneous sampling requirements of the IEC 61869 standard.