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VCA810问题

Other Parts Discussed in Thread: VCA810

在调试VCA810  的时候怎么发现VC 的变化改变虽然放大有变化,可是怎么也达不到40db  意味着要放大100倍,我是按照数据手册图 30 那么连接的。怎么放大才两倍呢,大于负 的一点四左右就没有波形了。而且感觉波形很粗。我是用信号发生器测试的。