I connected AD 8302 evaluation board with a digital multimeter Agilent 34410A to measure its voltage output. The input A and input B I used were same ac voltage signals with 50 mV peak-to-peak value. At first, the output voltage is correct. The amplitude output voltage was around 0.92 V, phase output voltage was 1.8 V and the reference voltage output was around 1.8 V. Then suddenly, the reference became around 5 V and amplitude and phase voltage output were totally wrong. Up till now, I cannot locate where the problem. We bought the evaluation board less than a month and we launched the first test yesterday. We hope we could get help from you to help us locate the problem or get devices replaced. Thank you so much for any help you could offer!