|
楼主 |
发表于 2012-3-31 20:37:04
|
显示全部楼层
本帖最后由 holmesruan 于 2012-3-31 20:44 编辑
xyx2012xyx 发表于 2012-3-31 19:22
INA169是检测输入端电压,跟高端还是低端没啥关系吧,不解!
“
Input common-mode and power-supply voltages are independent
and can range from 2.7V to 40V for the INA139 and
2.7V to 60V for the INA169. Quiescent current is only 60μA,
which permits connecting the power supply to either side of
the current measurement shunt with minimal error.
”
INA169的pdf中提到,input common-mode voltage(3脚上的电压)的取值范围是2.7到60,而我的电路中3脚电压不够。
具体为什么一定要2.7V以上,看了这个PDF都暂时没找到(感觉算是看懂一点点PDF中放大倍数的原理,但是还是不明白为什么要2.7V以上。) |
|