I have control board with oneDSP, one FPGA and two AD7656. System is used as power inverter. It has been running for couple of months. We experienced one AD7656 stop conversion(output all 0s) today. The other one works fine. I probed around it. All voltage, reference voltage and signals seem normal. CONVST x is from FPGA with 5.8us high and 0.2us low repetitively. Problem goes away after we reset the board. Data sheet mentioned partial shut down. I'm afraid ADC went to shut down mode. I wonder how can it get out of partial shut down mode. Data sheet doesn't say how long power up time is. Please help. Thank you!