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ADS1256: 调节输入电压,串口助手上一直输出0,没有反应

Part Number: ADS1256
Other Parts Discussed in Thread: OPA350

麻烦TI的工程师了,画了ADS1256的相关电路,MCU用的是STM32F407VGT6,改变输入电压,输出一直是0,不知道是哪里出了问题。附上原理图