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vca810 输出电压不对

Other Parts Discussed in Thread: DAC7811, VCA810, VCA821

我用的是vca810的dem板子,用430f169控制dac7811给vca810的可编程电压。测试的是 1Mhz ,10mv 放大100倍 ,但是上电之后只持续了几秒钟就衰减了 。这是什么原因