NATIONAL SEMICONDUCTOR -LM48860 Ground-Referenced Ultra Low Noise Fixed Gain Stereo Headphone Amplifier handbook
The LM48860 is a ground referenced, fixed-gain audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. It features a new circuit technology that utilizes a charge pump to generate a negative reference voltage, eliminating the need for output-coupling capacitors typically used with normal single-ended loads. The amplifier is suitable for mobile phone and low voltage applications with minimal power consumption. It also includes a low-power consumption shutdown mode, internal thermal shutdown protection mechanism, and advanced pop & click circuitry for noise elimination during turn-on and turn-off transitions.