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REF3450: REF3450输出电压不正常原因

Part Number: REF3450
Other Parts Discussed in Thread: ADS8866

如图使用REF3450为ADS8866提供5V基准,REF3450输出脚直接连接ADS8866基准输入时电压正常,加入运放做跟随缓冲后REF3450输出脚电压只有2.8V。

请问是什么原因?REF3450对输出负载最小电流有要求吗?