Low Power Audio Amplifier
The 34119 is a low power audio amplifier integrated circuit
intended 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.
Features
• Wide Operating Supply Voltage Range (2.0 V to 16 V), Allows
Telephone Line Powered Applications
• Low Quiescent Supply Current (2.7 mA Typ) for Battery Powered
Applications
• Chip Disable Input to Power Down the IC
• Low Power--Down Quiescent Current (65 µA Typ)
• Drives a Wide Range of Speaker Loads (8.0 Ohm and Up)
• Output Power Exceeds 250 mW with 32 Ohm Speaker
• Low Total Harmonic Distortion (0.5% Typ)
• Gain Adjustable from <0 dB to >46 dB for Voice Band
• Requires Few External Components
• Pb-Free Packaging Designated by Suffix Code EF
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