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 Consumption Headphone, Higher Output Power |
|
|
LM49352
