想要设计的应用是PT1000温度检测,想使用LM4128作为恒流源用 ,将RL电阻替换为PT1000然后ADC采样(精度为10位ADC),温度误差为+-2度。想问一下LM4128, Iout=2mA ,精度为0.5% 是否能达到这个要求?IGND电流如何计算? 恒流源芯片LM334是否能满足相同的要求??
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Hi
LM334也是可以的,这个是专门做电流源的芯片,但是只有10mAMAX的电流,如果要20mA要做电流扩展。