LM4937 Datasheet | National Semiconductor

Description The LM4937 is an integrated audio sub-system designed for mono voice, stereo music cell phones connecting to base band processors with mono differential analog voice paths. Operating on a 3.3V supply, it bines a mono speaker amplifier delivering 520m W into an 8Ω load, a stereo headphone amplifier delivering 36m W per channel into a 32Ω load, and a mono earpiece amplifier delivering 55m W into a 32Ω load. It integrates the audio amplifiers, volume control, mixer, and power management control all into a single package. In addition, the LM4937 routes and mixes the single-ended stereo and differential mono inputs into multiple distinct output modes. The LM4937 features an I2S serial interface for full range audio and an I2C or SPI patible interface for control. The full range music path features an SNR of 85d B with an 18-bit 48k Hz input. Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external ponents. Key Specifications -  POUT, BTL, 8Ω, 3.3V, 1% -  POUT H/P, 32Ω, 3.3V, 1% -  POUT Mono Earpiece, 32Ω, 1% -  Shutdown current -  SNR (DAC + Amplifier) 520m W (typ) 36m W (typ) 55m W (typ) 0.6µA (typ) 85d B (typ) Features - - - - - - - 18-bit stereo DAC Multiple distinct output modes Mono speaker amplifier Stereo headphone amplifier Mono earpiece amplifier Differential mono analog input Independent loudspeaker, headphone and mono earpiece volume controls - I2C/SPI (selectable) patible interface - Ultra low shutdown current - Click and Pop Suppression circuit Applications - Cell Phones - PDAs Boomer® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation .national. Block Diagram FIGURE 1. Audio Sub-System Block Diagram with OCL HP Outputs (HP outputs may also be configured as cap-coupled) Connection Diagrams - Bump Micro SMD Top View (Bump Side Down) Order Number LM4937TL See NS Package Number...