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AD7980 verilog

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    Rencently,I use the AD convert chip AD7980, and I write the driver code of the chip in the mode of 3-wire by Verilog HDL, when I acquire the DC voltage, the precision is quite well. However, when I acquire a AC voltage, the output of digital code doesn't work well, the wave of the acquire sine signal have a lot sudden change. The sample frequency is 100kHz, the signal frequency is 10Hz, the wave is shown in the attachment.