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https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/784787/ads1220-any-suggestion-for-the-refp0-and-refpn0-pins-if-external-ref-is-not-used
如果 未使用外部基准、则建议使用 REFP0和 REFPN0引脚。
