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DAC80501: VREFIO引脚输出2.498V

Part Number: DAC80501

DAC80501: VREFIO引脚输出2.38V - 数据转换器论坛 - 数据转换器 - E2ETm 设计支持 (ti.com)

我在TI官网采购了两个wson8封装的dac80501,测量vrefio引脚是2.498,误差稍大,我换过vrefio的电容到1uf,也是一样的。我们之前用过几次vssop10封装的dac80501,vrefio引脚是2.500.请问为什么wson8封装的基准电压会小一些?