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TLC7135C为什么只能读值到0.27V左右

Other Parts Discussed in Thread: TLC7135

为什么用TLC7135的芯片在120KHz的输入下,读正负0.27V左右以内的值都是准确的,超过0.27V一直到输入2V,读到的值一直还是0.27-0.28V左右?该电路哪里有问题吗?