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ADS8363: ADS8363 sometimes sample wrong data,typical values are -32768 and +32767

Part Number: ADS8363

Hello,TI data converter experts:

            We are using ADS8363 for two channel simultaneous sample.We use a FPGA to drive ADS8363,the problem we are facing is that sometimes when powering up ADS8363 load error and get wrong data,typically -32768 and +32767.The data picture shows a 448 points wrong data,most points of the data are wrong,typycal values are -32768 and +32767.The schematic on the follwering.We have been trying to solve this problem for a long time, but there has been no progrress,so we hope to get some help from you ,expect your response,thank you.