Interface circuit in conformity with EIA RS 232C norms put into use by an operational amplifier

摘要

the present invention relates to an interface circuit which meets international standards. so 232c or ccitt v8.this circuit is based on a conventional operational amplifier circuit with a gate is connected to a reference voltage (vref).combined with a plurality of means of protection (viii, ix, x and xi) against overvoltages applied to the positive and negative output terminal.a value significantly in excess of the supply voltage (v +, v -) and, on the other hand, a circuit of constant current polarization (xii).be in the form of a monolithic integrated semiconductor package, circuit is applied in the interfaces between terminals, modems, etc.