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LM4842
Stereo 2W Amplifiers with DC Volume Control, Input
MUX, Transient Free Outputs, and Cap-less Headphone
Drive
General Description
The LM4842 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4
(Note 1) or 2.2W into
3
(Note 2) with less than 1.0% THD+N.
Boomer audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4842 incorporates a
DC volume control, stereo bridged audio power amplifiers,
new cap-less headphone driver circuit (patent pending), se-
lectable gain or bass boost, and an input mux making it
optimally suited for multimedia monitors, portable radios,
desktop, and portable computer applications.
The LM4842 features an externally controlled, low-power
consumption shutdown mode (Shutdown Low), and both a
power amplifier and headphone mute for maximum system
flexibility and performance.
Note 1: When properly mounted to the circuit board, the LM4842MH will
deliver 2W into 4
. The LM4842MT will deliver 1.1W into 8. See the
Application Information section for LM4842MH usage information.
Note 2: An LM4842MH that has been properly mounted to the circuit board
and forced-air cooled will deliver 2.2W into 3
.
Key Specifications
n
P
O at 1% THD+N
n
into 3
(MH and LQ)
2.2W(typ)
n
into 4
(MH and LQ)
2.0W(typ)
n
into 8
(MT, MH, and LQ)
1.1W(typ)
n
Single-ended THD+N at 85mW into 32
1.0%(typ)
n
Shutdown current (Shutdown Low)
0.2A(typ)
Features
n
Stereo headphone amplifier mode that eliminates the
Output Coupling Capacitors (patent pending)
n
Advanced “click and pop” suppression circuitry
n
Acoustically Enhanced DC Volume Control Taper
n
2 Channel Stereo Input MUX
n
System Beep Detect
n
Stereo switchable bridged/single-ended power amplifiers
n
Selectable internal/external gain and bass boost
n
Thermal shutdown protection circuitry
Applications
n
Portable and Desktop Computers
n
Multimedia Monitors
n
Portable Radios, PDAs, and Portable TVs
Connection Diagrams
TSSOP Package
20028102
Top View
Order Number LM4842MT
See NS Package Number MTC28 for TSSOP
Order Number LM4842MH
See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer is a registered trademark of NationalSemiconductor Corporation.
October 2006
LM4842
Stereo
2W
Amplifiers
with
DC
V
olume
Control,
Input
MUX,
T
ransient
Free
Outputs,
and
Cap-less
Headphone
Drive
2006 National Semiconductor Corporation
DS200281
www.national.com
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相关代理商/技术参数
LM4842MH 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Amplifiers with DC Volume Control Transient Free Outputs, and Cap-less Headphone Drive
LM4842MH/NOPB 功能描述:IC AMP AUDIO PWR 2.2W AB 28TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4842MT 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Amplifiers with DC Volume Control Transient Free Outputs, and Cap-less Headphone Drive
LM4842MT/NOPB 功能描述:IC AMP AUDIO PWR 2.2W AB 28TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4843 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with DC Volume Control
LM4843MH 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with DC Volume Control
LM4843MHX 功能描述:IC AMP AUDIO PWR 2.2W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4844 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 1.2W Audio Sub-system with 3D Enhancement