HI 1. Customer can confirm that it is not caused by input overvoltage and there is no opposite polarity pulse every 128 clock cycles. 2. short probe groud, The customer conducted a test using a spring needle, as shown in the following figure. AVDD The waveform after testing with an isolation probe. The peak value and amplitude may not be correct because the high-voltage isolation probe has a relatively large amplification factor and a small bandwidth. Add a 2.2 Ω resistor as a snubber and a capacitor of 4.7uF, but the problem persists.
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