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VFC320: 关于芯片输入端最小电流的问题

Part Number: VFC320

芯片输入端电流IIN由VIN/R1决定,这里写到IIN最小为250nA,这是为什么呢?我在文档中没有找到这个最小电流为什么限制在250nA,麻烦TI工程师解惑。我有一个低至10nA的电流要输入,这种似乎不满足条件。