LM48824 Datasheet | National Semiconductor Corporation

LM48824 PRODUCT BRIEF LM48824 PRODUCT BRIEF March 26, 2009 Class G Headphone Amplifier with I2C Volume Control .. General Description The LM48824 is a Class G, ground-referenced stereo headphone amplifier designed for portable devices. The LM48824 Features National’s ground-referenced architecture, which eliminates the large DC blocking capacitors required by traditional headphone amplifiers, saving board space and minimizing system cost. The LM48824 takes advantage of National’s patent-pending Class G architecture offering power savings pared to a traditional Class AB headphone amplifier. Additionally, output noise is improved by 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. A high output impedance mode allows the LM48824's outputs to be driven by an external source without degrading the signal. Other Features include flexible power supply requirements, differential inputs for improved noise rejection, a low power (2.5μA) shutdown mode, and a 32-step I2C volume control with mute function. The LM48824's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48824 is available in an ultra-small 16-bump, 0.4mm pitch micro SMD package (1.69mm x 1.69mm) Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://.national./support/dir.html Key Specifications - Quiescent Power Supply Current at 3.6V - Output Power/channel at VDD = 3.6V RL = 16Ω, THD+N ≤ 1% - Output Power/channel at VDD = 3.6V RL = 32Ω, THD+N ≤ 1% - PSRR at 217Hz - Shutdown current 0.9m A (typ) 37m W (typ) 29m W (typ) 100d B (typ) 2.5μA (typ) Features - Class G Power Savings - Ground Referenced Headphone Outputs - Eliminates - - - - - - - Output Coupling...