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LM49370RL Datasheet

  • LM49370RL

  • National Semiconductor [Audio Sub-System with an Ultra Low ...

  • 2716.64KB

  • NSC

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LM49370 Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker
Amplifier, a Dual-Mode Stereo Headphone Amplifier, and a Dedicated PCM Interface for
Bluetooth Transceivers
February 2007
LM49370
Audio Sub-System with an Ultra Low EMI, Spread
Spectrum, Class D Loudspeaker Amplifier, a Dual-Mode
Stereo Headphone Amplifier, and a Dedicated PCM
Interface for Bluetooth Transceivers
1.0 General Description
The LM49370 is an integrated audio subsystem that supports
both analog and digital audio functions. The LM49370 in-
cludes a high quality stereo DAC, a mono ADC, a stereo
headphone amplifier, which supports output cap-less (OCL)
or AC-coupled (SE) modes of operation, a mono earpiece
amplifier, and an ultra-low EMI spread spectrum Class D
loudspeaker amplifier. It is designed for demanding applica-
tions in mobile phones and other portable devices.
The LM49370 features a bi-directional I
2
S interface and a bi-
directional PCM interface for full range audio on either inter-
face. The LM49370 utilizes an I
2
C or SPI compatible interface
for control. The stereo DAC path features an SNR of 85 dB
with an 18-bit 48 kHz input. In SE mode the headphone am-
plifier delivers at least 33 mW
RMS
to a 32鈩?single-ended
stereo load with less than 1% distortion (THD+N) when
A_V
DD
= 3.3V. The mono earpiece amplifier delivers at least
115mW
RMS
to a 32鈩?bridged-tied load with less than 1% dis-
tortion (THD+N) when A_V
DD
= 3.3V. The mono speaker
amplifier delivers up to 490mW into an 8鈩?load with less than
1% distortion when LS_V
DD
= 3.3V and up to 1.2W when
LS_V
DD
= 5.0V.
The LM49370 employs advanced techniques to reduce pow-
er consumption, to reduce controller overhead, to speed de-
velopment 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 com-
ponents. It is therefore ideally suited for mobile phone and
other low voltage applications where minimal power con-
sumption, PCB area and cost are primary requirements.
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SNR
LS
(AUX IN to Loudspeaker)
SNR
DAC
(Stereo DAC to AUXOUT)
SNR
ADC
(Mono ADC from Cell Phone In)
SNR
HP
(Aux In to Headphones)
90 dB (typ)
85 dB (typ)
90 dB (typ)
98 dB (typ)
4.0 Features
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Spread Spectrum Class D architecture reduces EMI
Mono Class D 8鈩?amplifier, 490 mW at 3.3V
OCL or AC-coupled headphone operation
33mW stereo headphone amplifier at 3.3V
115 mW earpiece amplifier at 3.3V
18-bit stereo DAC
16-bit mono ADC
8 kHz to 192 kHz stereo audio playback
8 kHz to 48 kHz mono recording
Bidirectional I
2
S compatible audio interface
Bidirectional PCM compatible audio interface for
Bluetooth transceivers
I
2
S-PCM Bridge with sample rate conversion
Sigma-Delta PLL for operation from any clock at any
sample rate
Digital 3D Stereo Enhancement
FIR filter programmability for simple tone control
Low power clock network operation if a 12 MHz or 13 MHz
system clock is available
Read/write I
2
C or SPI compatible control interface
Automatic headphone & microphone detection
Support for internal and external microphones
Automatic gain control for microphone input
Differential audio I/O for external cellphone module
Mono differential auxiliary output
Stereo auxiliary inputs
Differential microphone input for internal microphone
Flexible audio routing from input to output
32 Step volume control for mixers in 1.5 dB steps
16 Step volume control for microphone in 2 dB steps
Programmable sidetone attenuation in 3 dB steps
Two configurable GPIO ports
Multi-function IRQ output
Micro-power shutdown mode
Available in the 4 x 4 mm 49 bump micro SMDxt package
2.0 Applications
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Smart phones
Mobile Phones and Multimedia Terminals
PDAs, Internet Appliances and Portable Gaming
Portable DVD/CD/AAC/MP3 Players
Digital Cameras/Camcorders
3.0 Key Specifications
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P
HP (AC-COUP)
(A_V
DD
= 3.3V, 32鈩? 1% THD)
P
HP (OCL)
(A_V
DD
= 3.3V, 32鈩? 1% THD)
P
LS
( LS_V
DD
= 5V, 8鈩? 1% THD)
P
LS
(LS_V
DD
= 4.2V, 8鈩? 1% THD)
P
LS
(LS_V
DD
= 3.3V, 8鈩? 1% THD)
Shutdown Current
PSRR
LS
(217 Hz, LS_V
DD
= 3.3V)
33 mW
31 mW
1.2 W
900 mW
490 mW
0.8 碌A(chǔ)
70 dB
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
201917
www.national.com

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