A line driver circuit having first and second differential input terminals and first and second differential output terminals, the line driver circuit configured to interface with first and second termination impedances coupled between the first and second differential output terminals, and first and second transmit chain output terminals, respectively, comprising: an amplifier circuit having first and second input terminals (20, 22) coupled to the first and second differential input terminals of the line driver circuit, respectively, and first and second output terminals (26, 28) coupled to the first and second differential output terminals of the line driver circuit, respectively; an impedance switching circuit coupled between the first and second output terminals of the amplifier circuit, wherein the impedance switching circuit is configured to switch between a first switching configuration and a second switching configuration, characterized in that the impedance switching circuit comprises: a first impedance; a first switch coupled in series with the first impedance; a second switch connected in series with the first switch at a connection node; a second impedance connected in series with the second switch; and one of a common mode voltage or a circuit ground coupled to the connection node between the first and second closed switches, thereby balancing a voltage drop across the first and second impedances, wherein in the first switching configuration the first and second switches are open, resulting in the impedance switching circuit operating as an open circuit at the first and second output terminals (26, 28) of the amplifier circuit, and wherein in the second switching configuration the first and second switches are closed, thereby effectively connecting the first and second impedance together in series between the first and second output terminals of the amplifier circuit. an amplifier circuit having first and second input terminals (20, 22) coupled to the first and second differential input terminals of the line driver circuit, respectively, and first and second output terminals (26, 28) coupled to the first and second differential output terminals of the line driver circuit, respectively; an impedance switching circuit coupled between the first and second output terminals of the amplifier circuit, wherein the impedance switching circuit is configured to switch between a first switching configuration and a second switching configuration, a first impedance; a first switch coupled in series with the first impedance; a second switch connected in series with the first switch at a connection node; a second impedance connected in series with the second switch; and one of a common mode voltage or a circuit ground coupled to the connection node between the first and second closed switches, thereby balancing a voltage drop across the first and second impedances, wherein in the first switching configuration the first and second switches are open, resulting in the impedance switching circuit operating as an open circuit at the first and second output terminals (26, 28) of the amplifier circuit, and wherein in the second switching configuration the first and second switches are closed, thereby effectively connecting the first and second impedance together in series between the first and second output terminals of the amplifier circuit.