常用运放IC LM339.pdf .pdf LM139/LM239/LM339/LM2901/LM3302 Low Power Low Offset Voltage Quad Comparators May 1999 LM139/LM239/LM339/LM2901/LM3302 Low Power Low Offset Voltage Quad Comparators General Description n Reduced VOS drift over temperature n Eliminates need for dual supplies The LM139 series consists of four independent precision n Allows sensing near GND voltage comparators w……