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AFE5818EVM: AFE5818EVM connected TSW1400EVM have a significant fluctuations in the amplitude of ADC data

Part Number: AFE5818EVM

What could be causing significant fluctuations in the amplitude of ADC data over time when I connect AFE5818EVM to TSW1400EVM, and input a fixed amplitude 100mV, 1MHz sine signal to the input of AFE5818EVM using a signal generator, as observed through HSDC Pro?