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ADS1278: 负电压采集符号位丢失问题

Part Number: ADS1278

对比了两块板相同电路板上ADC,其中一块采集正弦电压正常。当使用同样的 FPGA板连接第二块时,发现该板上ADC采集负电压会丢失符号位。请问这是什么情况?更换新的ADS1278也同样如此。