MC34119

The MC34119 has the following features including (1)Wide Operating Supply Voltage Range (2.0 V to 16 V), Allows Telephone Line Powered Applications;(2)Low Quiescent Supply Current (2.7 mA Typ) for Battery Powered Applications;(3)Chip Disable Input to Power Down the IC;(4)Low PowerDown Quiescent Current (65 A Typ);(5)Drives a Wide Range of Speaker Loads (8.0 and Up);(6)Gain Adjustable from <0 dB to >46 dB for Voice Band.

The MC34119 is a low power audio amplifier intergrated circuit intended (primarily) for telephone applications, such as in speakerphones. It provides differential speaker outputs to maximize output swing at low supply voltages (2.0 V minimum). Coupling capacitors to the speaker are not required. Open loop gain is 80 dB, and the closed loop gain is set with two external resistors.A Chip Disable pin permits powering down and/or muting the input signal.The MC34119 is available in standard 8pin DIP, SOIC package, and TSSOP package.The MC34119 is a low power audio amplifier capable of low voltage operation (VCC = 2.0 V minimum) such as that encountered in linepowered speakerphones. The circuit provides a differential output (VO1VO2) to the speaker to maximize the available voltage swing at low voltages.The differential gain is set by two external resistors. Pins FC1 and FC2 allow controlling the amount of power supply and noise rejection, as well as providing alternate inputs to the amplifiers. The CD pin permits powering down the IC for muting purposes and to conserve power.

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