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该ADC的datasheet为什么没有说明芯片的参考电压是多少?

Part Number: ADC14X250

ADC的datasheet没有说明芯片的参考电压是多少?

比如这个ADC设置为二进制补码输出,那他的计算公式是什么呢?Vp-Vn=N/8192 *VREF,这个VREF具体是多少呢?