LM48822 Datasheet | National Semiconductor Corporation

Description The LM48822 is a single supply, ground-referenced stereo headphone amplifier designed for portable devices, such as cell phones, where board space is at a premium. The LM48822 features National’s ground-referenced architecture, which eliminates the large DC blocking capacitor required by traditional headphone amplifiers, saving board space and minimizing system cost. The LM48822 features mon-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches. The LM48822 delivers 35m W/channel into a 16Ω load with <1% THD+N with a 3.6V supply. High power supply rejection ratio (PSRR), of 110d B at 217Hz, allows the device to operate in noisy environments without additional power supply conditioning. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48822 has a differential inputs for improved noise rejection. High output impedance in Shutdown mode, bined with a charge pump-only mode allows the LM48822's outputs to be driven by an external source without degrading the source signal. Additionally, the LM48822 features a 64-step I2C volume control and mute function. The low power Shutdown mode reduces supply current consumption to 0.06µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48822 is available in an ultra-small 16-bump micro SMD package (2mmx2mm) Key Specifications - Output Power/channel at VDD = 3.6V RL = 16Ω, THD+N ≤ 1% - Output Power/channel at VDD = 3.6V RL = 32Ω, THD+N ≤ 1% -  Quiescent Power Supply Current at 3.6V 3.5m A (typ) 110d B (typ) 0.06μA (typ) 35m W (typ) 40m W (typ) -  PSRR at 217Hz -  Shutdown current Features - Ground Referenced Outputs - Eliminates Output Coupling - - - - - - - - - - Capacitors mon-Mode Sense Ultra-High PSRR I2C Volume and Mode Control High Output Impedance in Shutdown Differential Inputs Advanced Click-and-Pop Suppression...