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ADS7864的基准电压是2.5V,12位补码输出，请问ADS7864在单端输入，输入电压是2.5V和5V的话输出数字量是多少？
2,5V接V+，5V接V-？还是2.5V接V+，V-接GND；5V接V+，V-接GND？如果是单端V+输入，需确保V-上接一个共模电平，该电平与V+的共模相等。
