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选择12bit ,parallel ,voltage output后第一个是DAC7621，写的电压输出-2.5到+2.5，但看了datasheet发现输出0到4.095V啊？？？
而且选型页面写着有ext和int，但是datasheet里好像不能外接参考电压???
TI的芯片太多了，60000种，可能这个在提取参数的时候出现问题了。还是以手册为主
