LM48822 Datasheet | Texas Instruments

FEATURES - 23 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 - Low Supply Current - Minimum External ponents - Micro-Power Shutdown - Available in Space-Saving 16-Bump DSBGA Package APPLICATIONS - Mobile Phones - PDAs - Notebook PCs - Portable Electronic Devices - MP3 Players KEY SPECIFICATIONS - Output Power/Channel at VDD = 3.6V - RL = 16Ω, THD+N ≤ 1%: 35m W (typ) - Output Power/Channel at VDD = 3.6V - RL = 32Ω, THD+N ≤ 1%: 40m W (typ) - Quiescent Power Supply Current at 3.6V: 3.5m A (typ) - PSRR at 217Hz: 110d B (typ) - Shutdown Current: 0.06μA (typ) 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 TI’s groundreferenced 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...