Audio Subsystem 36-Pin Micro SMD T/R

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 combines a mono speaker amplifier delivering 520mW into an 8? load, a stereo headphone amplifier delivering 36mW per channel into a 32? load, and a mono earpiece amplifier delivering 55mW into a 32? 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 compatible interface for control. The full range music path features an SNR of 85dB with a 192kHz playback.Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components.

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) Compatible Interface

Ultra Low Shutdown Current

Click and Pop Suppression Circuit

P_OUT, BTL, 8?, 3.3V, 1%: 520 mW (typ)

P_OUT H/P, 32?, 3.3V, 1%: 36 mW (typ)

P_OUT Mono Earpiece, 32?, 1%: 55 mW (typ)

Shutdown current: 0.6µA (typ)

SNR (DAC + Amplifier): 85 dB (typ)