Features
| • | 18-bit stereo DAC |
| • | Multiple distinct output modes |
| • | Stereo speaker amplifier |
| • | Stereo headphone amplifier |
| • | Mono earpiece amplifier |
| • | Mono Line Output for external handsfree carkit |
| • | Independent Left, Right, headphone and Mono speaker volume controls |
| • | National 3D enhancement with programmable effect level |
| • | I2C/SPI (selectable) compatible interface |
| • | Ultra low shutdown current |
| • | Click and Pop Suppression circuit |
Description The LM4934 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines a stereo speaker amplifier delivering 520mW per channel into an 8 load, a stereo headphone amplifier delivering 36mW per channel into a 32 load, a mono earpiece amplifier delivering 55mW into a 32 load, and a line output for an external powered handsfree speaker. It integrates the audio amplifiers, volume control, mixer, power management control, and National 3D enhancement all into a single package. In addition, the LM4934 routes and mixes the stereo and mono inputs into multiple distinct output modes. The LM4934 features an I2S serial interface for full range audio and an I2C/SPI compatible interface for control.
Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components.
Key Specification
| POUT, Stereo BTL, 8, 3.3V, 1% THD+N | 520mW (typ) |
| POUT HP, 32, 3.3V, 1% THD+N | 36mW (typ) |
| POUT Mono Earpiece, 32, 3.3V, 1% THD+N | 55mW (typ) |
| Shutdown current | 0.6µA (typ) |
| DAC SNR | 95dB (typ) |
Applications
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LM4934
