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请问关于PCM4220和PCM1792A的量程问题

Other Parts Discussed in Thread: PCM4220, PCM1792A

经过电路板的实际测试发现PCM4220的输入范围达不到手册中说的5.6V,测试结果是5.4V;PCM1792A的输出电流也达不到手册中说的7.8mA,实际测试在7.5mA,请问这是什么原因,电路就是按照手册中给出