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參數資料
型號： LM4935WL
廠商： National Semiconductor Corporation
元件分類： ADC
英文描述： Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
中文描述： 音頻子系統的雙模單聲道立體聲耳機和揚聲器放大器的高效率和多功能模數轉換器
文件頁數： 1/112頁
文件大小： 5017K
代理商： LM4935WL
LM4935
Audio Sub-System with Dual-Mode Stereo Headphone &
Mono High Efficiency Loudspeaker Amplifiers and
Multi-Purpose ADC
1.0 General Description
The LM4935 is an integrated audio subsystem that supports
both analog and digital audio functions. The LM4935 in-
cludes a high quality stereo DAC, a mono ADC, a multi-
purpose SAR ADC, a stereo headphone amplifier, which
supports output cap-less (OCL) orAC-coupled (SE)modes of
operation, a mono earpiece amplifier and a mono high effi-
ciency loudspeaker amplifier. It is designed for demanding
applications in mobile phones and other portable devices.
The LM4935 features a bi-directional I
2
S serial interface for
full range audio and an I
2
C or SPI compatible interface for
control. The stereo DAC path features an SNR of 88 dB with
an 18-bit 48 kHz input. In SE mode the headphone amplifier
delivers at least 33 mW
RMS
to a 32
single-ended stereo
load with less than 1% distortion (THD+N) when A_V
DD
=
3.3V. The mono earpiece amplifier delivers at least 115
mW
RMS
to a 32
bridged-tied load with less than 1% distor-
tion (THD+N) when A_V
DD
= 3.3V. The mono speaker am-
plifier delivers up to 600 mW into an 8
load with less than
1% distortion when LS_V
DD
= 3.3V and up to 1.3W when
LS_V
DD
= 5.0V. The LM4935 also contains a general pur-
pose SAR ADC for housekeeping duties such as battery and
temperature monitoring. This can also be used for analog
volume control of the output stages and can trigger interrupt
events.
The LM4935 employs advanced techniques to reduce power
consumption, to reduce controller overhead to speed devel-
opment 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
n
Smartphones
n
Mobile Phones and Multimedia Terminals
n
PDAs, Internet Appliances and Portable Gaming
n
Portable DVD/CD/AAC/MP3 Players
n
Digital Cameras/Camcorders
3.0 Key Specifications
n
P
HP (AC-COUP)
@
A_V
DD
= 3.3V, 32
, 1% THD
n
P
HP (OCL)
@
A_V
DD
= 3.3V, 32
, 1% THD
n
P
LS
@
LS_V
DD
= 5V, 8
, 1% THD
n
P
LS
@
LS_V
DD
= 4.2V, 8
, 1% THD
n
P
LS
@
LS_V
DD
= 3.3V, 8
, 1% THD
33 mW
31 mW
1.3 W
900 mW
600 mW
j
Supply Voltage Range
BB_V
DD
= 1.8V to 4.5V,
D_V
DD
& PLL_V
DD
= 2.7V to 4.5V
LS_V
DD
& A_V
DD
= 2.7V to 5.5V
n
Shutdown Current
n
PSRR
@
217 Hz, A_V
DD
= 3.3V, (Headphone)
n
SNR (Stereo DAC to AUXOUT)
n
SNR (Mono ADC from Cell Phone In)
n
SNR (Aux In to Headphones)
1.1 μA
60 dB
88 dB (typ)
90 dB (typ)
98 dB (typ)
4.0 Features
n
18-bit stereo DAC
n
16-bit mono ADC
n
12-bit 4 input multipurpose SAR ADC
n
8 kHz to 48 kHz stereo audio playback
n
8 kHz to 48 kHz mono recording
n
1 Hz to 13.888 kHz sample rate on all 4 SAR channels
n
Bidirectional PCM/I
2
S compatible audio interface
n
Sigma-Delta PLL for operation from any clock at any
sample rate
n
Low power clock network operation if 12 MHz system
clock is available
n
Read/write I
2
C or SPI compatible control interface
n
33mW stereo headphone amplifier at 3.3V
n
OCL or AC-coupled headphone operation
n
Automatic headphone & microphone detection
n
Support for internal and external microphones
n
Automatic gain control for microphone input
n
High efficiency BTL 8
amplifier, 600 mW
@
3.3V
n
115 mW earpiece amplifier at 3.3V
n
Differential audio I/O for external cellphone module
n
Mono differential auxiliary output
n
Stereo auxiliary inputs
n
Differential microphone input for internal microphone
n
Flexible audio routing from input to output
n
32 Step volume control for mixers with 1.5 dB steps
n
16 Step volume control for microphone in 2 dB steps
n
Programmable sidetone attenuation in 3 dB steps
n
DC Volume Control
n
Two configurable GPIO ports
n
Programmable voltage triggers on SAR channels
n
Multi-function IRQ output
n
Micro-power shutdown mode
n
Available in the 4 x 4 mm 49 bump microfil package
Boomer
is a registered trademark of National Semiconductor Corporation.
October 2005
L
L
2005 National Semiconductor Corporation
DS201341
www.national.com
相關PDF資料
PDF描述
LM4935WLX Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
LM4936 Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C)
LM4951 Wide Voltage Range 1.8 Watt Audio Amplifier
LM4953 Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver
LM4953SD Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver
相關代理商/技術參數
參數描述
LM4935WLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
LM4936 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C)
LM49360 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RL 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RLX 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
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