The electric current interface which possesses the obstruction capacitor which is connected to the addition pin

摘要

It is described a current interface (100, 200) with a blocking capacitor (128, 228). The blocking capacitor (128, 228) is attached to an additional pin (115, 215), thus allowing a supply voltage ripple rejection of an internal sensor circuit (130, 230). The supply lines (160, 260, 170, 270) are decoupled from the capacitor (128, 228) by a diode (125) or by a voltage regulator (226). Thereby, the use of a sensor element (132, 232) with the current interface (100, 200) does not restrict the size of the blocking capacitor (128, 228) because transient times of edges of output current signals of the current interface (100, 200) are not affected by a low-pass behavior of the blocking capacitor (128, 228) combined with a sensing resistor (171, 271) being typically used for measuring the amperage of the output current signals.