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DAC7621: DAC7621的reference性能精度,可以使用外部输入ref吗

Part Number: DAC7621
Other Parts Discussed in Thread: DAC63004, DAC60501, DAC53701

看datasheet,没有看到关于内部 参考源的性能指标?另外,选型表上写支持内部,外部参考源,如何使用外部参考源啊?