求推荐一款TI的1mA~4mA恒流源芯片(满足范围都可以).用于PT100测温。谢谢啦!
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http://www.ti.com/lit/an/sbva001/sbva001.pdf
原理可以看上面这个应用。就是采样电阻的电流作为参考值通过运放反馈,实现恒流。