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SN65LVDS1: 电压输出与芯片手册描述不符

Part Number: SN65LVDS1

请问使用SN65LVDS1DBVR作为单端转lvds驱动器,供电电压为3.3,输入为STM32F103的io口,由于没有差分探头,测量差分的P端电压,范围约为0-2V,测量差分的N端电压,范围约为0.3-2.3V,和手册上写的LVDS差分输出电压1.25+-350mv不符?