This data sheet introduces the functions and features of TEA1062 and TEA1062A, including low DC line voltage, adjustable static resistance, external circuit supply, symmetrical high impedance input, DTMF signal input, mute input, dynamic, magnetic or piezoelectric earpiece receiving amplifier, large gain setting range on microphone and earpiece amplifiers, line loss compensation, gain control curve adaptable to exchange supply, DC line voltage adjustment device.