LM49350 - High Perf Codec Sub-Sys w/ Gnd-Ref St Headph Amp Ultra Low EMI Class D Loudspkr Amp

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 69mW_RMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_V_DD = 3.3V. The earpiece speaker amplifier delivers 58mW_RMS (typ) to a 32Ω bridged-tied load with less than 1% distortion (THD+N) when A_V_DD = 3.3V. The loudspeaker amplifier delivers up to 495mW into an 8Ω load with less than 1% distortion when LS_V_DD = 3.3V and up to 1.2W when LS_V_DD = 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.

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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

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