Features • High performance 96dB SNR stereo DAC • High performance 94dB SNR stereo ADC • Up to 192kHz stereo audio playback • Up to 48kHz stereo recording • Dual bidirectional I 2S or PCM compatible audio interfaces • Read/write I 2C compatible control interface • Flexible digital mixer with sample rate conversion • Dual sigma-delta PLLs for operation from any clock at any sample rate • Digital 3D stereo enhancement • Dual 5 band parametric equalizers • Cascadable DSP effects that allow 10 band parametric equalization • ALC/Compressor/Limiter on both DAC and ADC paths • Ultra low EMI, Class D loudspeaker amplifier with spread spectrum control • Ground referenced output cap-less headphone amplifier operation • Earpiece speaker amplifier with reduced power consumption mode for mono differential line out applications • Stereo auxiliary inputs or mono differential input • Differential stereo microphone inputs with single-ended option • Automatic level control for digital audio inputs, stereo microphone inputs, and stereo auxiliary inputs • Flexible audio routing from input to output • 16 Step volume control for microphones with 2dB steps • 32 Step volume control for auxiliary inputs in 1.5dB steps • Micro-power shutdown mode • Available in the 3.5 x 3.5 mm 36 bump micro SMD package Description The LM49350 is a high performance audio subsystem that supports both analog and digital audio functions. The LM49350 includes a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier that supports ground referenced output cap-less operation, a dual mode earpiece speaker amplifier, and a low EMI Class D loudspeaker amplifier. It is designed for demanding applications in mobile phones and other portable devices. The LM49350 features dual bi-directional I 2S or PCM audio interfaces for full range audio and an I 2C compatible interface for control. The stereo DAC path features an SNR of 96dB with 24-bit 48 kHz input. The headphone amplifier delivers 69mWRMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The earpiece speaker amplifier delivers 58mWRMS (typ) to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The loudspeaker amplifier delivers up to 495mW into an 8Ω load with less than 1% distortion when LS_VDD = 3.3V and up to 1.2W when LS_VDD = 5.0V. The LM49350 employs advanced techniques to reduce power consumption, to reduce controller overhead, to speed development time, and to eliminate click and pop. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area and cost are primary requirements. Key Specification PHP at A_VDD = 3.3V, Stereo 32Ω, 1% THD 69mW/ch (typ) PLS at LS_VDD = 5V, 8Ω, 1% THD 1.2W (typ) PLS at LS_VDD = 4.2V, 8Ω, 1% THD 825mW (typ) PLS at LS_VDD = 3.3V, 8Ω, 1% THD 495mW (typ) PEP at A_VDD = 3.3V, 32Ω BTL, 1% THD 58mW (typ) ■  Supply Voltage Range     D_VDD = 1.7V to 2.0V    LS_VDD and A_VDD = 2.7V to 5.5V    I/O_VDD = 1.6V to 4.5V   SNR (Stereo DAC at 48kHz) 96dB (typ) SNR (Stereo ADC at 48kHz) 94dB (typ) Shutdown Current 2.3µA (typ) PSRR at 217 Hz, A_VDD = 3.3V, (HP from AUX) 97dB (typ) Applications • Smart Phones • Mobile Phones and VOIP Phones • Portable GPS Navigator and Portable Gaming Devices • Portable DVD/CD/AAC/MP3/MP4 Players • Digital Cameras/Camcorders

Also Recommended LM49352▲ Lower Power Cusumption Headphone, Higher Output Power MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram *click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM49350 High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier & an Ultra Low EMI Class D Loudspeaker Amplifier with Dual I 2 S/PCM Digital Audio Interfaces	3475 Kbytes	1-Jun-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1432: Application Note 1432 The LM4935 Headset/Push-Button Detection Guide	464 Kbytes	24-Apr-06	中文
	AN-1451: Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide	550 Kbytes	24-Apr-06	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1432: Application Note 1432 The LM4935 Headset/Push-Button Detection Guide	464 Kbytes	24-Apr-06	中文
	AN-1451: Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide	550 Kbytes	24-Apr-06	中文