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一般短距离的,或者data rate不高的话,不接匹配电阻影响也不是很大,信号反射主要是高data rate,长传输距离前提下由于阻抗不匹配产生的。
所以要看实际应用。
我查了下MAX3490的datasheet,是3.3V供电,而 AM26LS31 是5Vpower supply,所以要看下二者接口电平是否匹配。