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手册上这个失调电压PRODUCTION DISTRIBUTION图表是什么意思?

Other Parts Discussed in Thread: OPA2704

这是从opa2704手册截取的,第一个图猜测是一批产品的失调电压差异分布,但是手册上失调电压典型值都要160uV,跟图表又对不上,求解释。

另外请问失调电压如何校准,需要在不同温度下都校准一次吗,还是可以简单推算呢?