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请问ADS8688IDBTR的AVDD是5V，如何实现负电压输入及5V以上电压输入的
您好，
只是ADS8688芯片功能决定的。
它内部集成过压保护电路，支持5V供电，允许双极性和单极性输入电压。在“8.5.2.3.3 Range Select Registers (addresses 05h-0Ch)”定义范围。
具体请参考芯片数据手册“8.3.1 Analog Inputs”。
ADS868x 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges datasheet (Rev. C) (ti.com)
