LM48861

LM48861 PowerWise® Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier LM48861 March 16, 2010 Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier General Description The LM48861 is a single supply, ground-referenced stereo headphone amplifier. Part of National's PowerWise® product family, the LM48861 consumes only 3mW of power, yet still provides great audio performance. The ground-referenced architecture eliminates the larger DC blocking capacitors required by traditional headphone amplifier's saving board space and reducing cost. The LM48861 features common-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 LM48861 delivers 22mW/channel into a 32Ω load with <1% THD+N with a 1.8V supply. Power supply requirements allow operation from 1.2V to 2.8V. High power supply rejection ratio (PSRR), 83dB at 217Hz, allows the device to operate in noisy environments without additional power supply conditioning. A low power shutdown mode reduces supply current consumption to 0.01µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48861 is available in an ultra-small 12-bump, 0.4mm pitch, micro SMD package (1.215mm x 1.615mm). Key Specifications ■ Output Power/channel at VDD = 1.5V, THD+N = 1% RL = 16Ω RL = 32Ω 12mW (typ) 13mW (typ) ■ Output Power/channel at VDD = 1.8V, THD...