[问答]

DAC8811想实现Vref是正压，将运放的电源轨道变为±2.5V是否可行？

问答对人有帮助，内容完整，我也想知道答案 0 datasheet显示的是Vref是负压，输出Vout是正压，我想实现Vref是正压，但是Vout想输出负压，我将运放的电源轨道变为±2.5V 是否可行？如果不可信请告诉我应该怎么做，最好有原理图 0 本主题由 Harmony技术专家于 2024-11-14 15:24 审核通过
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答案对人有帮助，有参考价值 0 好， `![](https://file1.elecfans.com/web2/M00/FF/87/wKgZomapYQiADqXnAABWTnf-JxE159.jpg) Figure 21的VREF如果输入2.5V，输出就是负压。但是OPA277不是轨至轨运放，建议使用 ±5V供电。`

2024-11-14 15:09:45 评论举报夏日余晖

答案对人有帮助，有参考价值 0 要实现Vref为正压，Vout为负压，将运放的电源轨道变为±2.5V是可行的。以下是实现这一目标的步骤和原理图： 1. 首先，将DAC8811的Vref引脚连接到+2.5V电源轨道。这样，Vref将为正压。 2. 将DAC8811的Vout引脚连接到运放的非反相输入端（+）。 3. 将运放的反相输入端（-）连接到一个电位器，电位器的一端接地，另一端接+2.5V电源轨道。通过调整电位器，可以设置运放的反相输入端电压，从而实现Vout为负压。 4. 将运放的输出端（Vout）连接到所需的负压输出。原理图如下： ``` +2.5V \| +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+

2024-11-14 17:54:20 评论举报湛蓝