FAQ
4-20mA高精度电流采集,ADC前端做0-200Hz低通滤波,使用ADI的FilterCAD设计电路并在Multisim中仿真均正常。
实际PCB板,输入4mA电流信号,使用100Ω精密电阻做I-V转换,滤波器前三级AD8628输出均正常,为0.4V, 最后一级AD8628输出为0.7V,将最后一级AD8628输出开路(拆除ADC芯片),
输出仍然异常,请问这是什么原因。
1.请问AD8628的供电,可以采用V+接+5V,V-接-5V吗?
红色方框的内容“5 V单电源操作”,意思是必须接5V单电源供电? V+接+5V,V-接-5V不可以吗?
2. 请问ADA4505的供电,必须是“1.8 V至5 V单电源或±0.9 V至±2.5 V双电源供电”吗? V+接+5V,V-接-5V不可以吗?
注 : 纯新手,手册看不懂,求求各位帮帮忙。
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