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采集条件：市电220V ； 电流 4-18A（电机电流）
运放输入：电流和电压互感器，互感器输出电流0-5mA
通过运放输出0-3.3V信号
求教参考电路和推荐芯片
看下这个参考设计：
http://www.ti.com.cn/tool/cn/tida-00454
