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Número de pieza | LM49370 | |
Descripción | Audio Sub-System | |
Fabricantes | National Semiconductor | |
Logotipo | ||
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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 I2S interface and a bi-
directional PCM interface for full range audio on either inter-
face. The LM49370 utilizes an I2C 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 mWRMS to a 32Ω single-ended
stereo load with less than 1% distortion (THD+N) when
A_VDD = 3.3V. The mono earpiece amplifier delivers at least
115mWRMS to a 32Ω bridged-tied load with less than 1% dis-
tortion (THD+N) when A_VDD = 3.3V. The mono speaker
amplifier delivers up to 490mW 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 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.
2.0 Applications
■ 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
■ PHP (AC-COUP) (A_VDD = 3.3V, 32Ω, 1% THD)
■ PHP (OCL) (A_VDD = 3.3V, 32Ω, 1% THD)
■ PLS ( LS_VDD = 5V, 8Ω, 1% THD)
■ PLS (LS_VDD = 4.2V, 8Ω, 1% THD)
■ PLS (LS_VDD = 3.3V, 8Ω, 1% THD)
■ Shutdown Current
■ PSRRLS (217 Hz, LS_VDD = 3.3V)
33 mW
31 mW
1.2 W
900 mW
490 mW
0.8 µA
70 dB
■ SNRLS (AUX IN to Loudspeaker)
■ SNRDAC (Stereo DAC to AUXOUT)
■ SNRADC (Mono ADC from Cell Phone In)
■ SNRHP (Aux In to Headphones)
90 dB (typ)
85 dB (typ)
90 dB (typ)
98 dB (typ)
4.0 Features
■ Spread Spectrum Class D architecture reduces EMI
■ Mono Class D 8Ω 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 I2S compatible audio interface
■ Bidirectional PCM compatible audio interface for
Bluetooth transceivers
■ I2S-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 I2C 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
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 201917
www.national.com
1 page 7.0 Connection Diagrams
49 Bump micro SMDxt
49 Bump micro SMDxt Marking
201917p3
Top View (Bump Side Down)
Order Number LM49370RL
See NS Package Number RLA49UUA
Top View
201917q7
XY — Date Code
TT — Die Traceability
G — Boomer
I3 — LM49370RL
5 www.national.com
5 Page LM49370
Symbol
Parameter
Conditions
Typical
(Note 6)
Limit
(Notes 7,
11)
Units
fPCMCLK
PCM CLK Frequency
DCI2S_CLK
I2S_CLK Duty Cycle
fS = 48kHz; 16 bit mode
fS = 48kHz; 25 bit mode
fS = 8kHz; 16 bit mode
fS = 8kHz; 25 bit mode
Min
Max
0.768
1.2
0.128
0.2
MHz
MHz
MHz
MHz
40 % (min)
60 % (max)
DCI2S_WS
I2C
I2S_WS Duty Cycle
50 %
TI2CSET
TI2CHOLD
SPI
I2C Data Setup Time
I2C Data Hold Time
Refer to Pg. 16 for more details
Refer to Pg. 16 for more details
100 ns (min)
300 ns (min)
TSPISETENB
Enable Setup Time
TSPIHOLD-ENB Enable Hold Time
TSPISETD
Data Setup Time
TSPIHOLDD
Data Hold Time
TSPICL
Clock Low Time
TSPICH
Clock High Time
VOLUME CONTROL
100 ns (min)
100 ns (min)
100 ns (min)
100 ns (min)
500 ns (min)
500 ns (min)
Minimum Gain w/ AUX_BOOST OFF
–46.5
dB
VCRAUX
AUX Volume Control Range
Maximum Gain w/ AUX_BOOST OFF
Minimum Gain w/ AUX_BOOST ON
0
–34.5
dB
dB
Maximum Gain w/ AUX_BOOST ON
12
dB
Minimum Gain w/ DAC_BOOST OFF
–46.5
dB
VCRDAC
DAC Volume Control Range
Maximum Gain w/ DAC_BOOST OFF
Minimum Gain w/ DAC_BOOST ON
0
–34.5
dB
dB
Maximum Gain w/ DAC_BOOST ON
12
dB
VCRCPIN
CPIN Volume Control Range
Minimum Gain
Maximum Gain
–34.5
12
dB
dB
VCRMIC
MIC Volume Control Range
Minimum Gain
Maximum Gain
6 dB
36 dB
VCRSIDE
SIDETONE Volume Control Range
Minimum Gain
Maximum Gain
–30 dB
0 dB
SSAUX
AUX VCR Stepsize
1.5 dB
SSDAC
DAC VCR Stepsize
1.5 dB
SSCPIN
CPIN VCR Stepsize
1.5 dB
SSMIC
MIC VCR Stepsize
2 dB
SSSIDE
SIDETONE VCR Stepsize
3 dB
AUDIO PATH GAIN W/ STEREO (bit 6 of 0x00h) ENABLED (AUX_L & AUX_R signals identical and selected onto mixer)
Minimum Gain from AUX input,
BOOST OFF
–34.5
dB
Loudspeaker Audio Path Gain
Maximum Gain from AUX input,
BOOST OFF
12
dB
Minimum Gain from CPI input
–22.5
dB
Maximum Gain from CPI input
24
dB
11 www.national.com
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet LM49370.PDF ] |
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