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MAX4409

更新时间： 2024-11-29 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
20页 430K
描述
80mW、DirectDrive立体声耳机放大器，带有共模检测

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MAX4409 数据手册

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19-2842; Rev 3; 6/09  
80mW, DirectDrive, Stereo Headphone  
Amplifier with Common-Mode Sense  
General Description  
Features  
♦ No Bulky DC-Blocking Capacitors Required  
The MAX4409 stereo headphone amplifier combines  
Maxim’s DirectDrive® architecture and a common-  
mode sense input, which allows the amplifier to reject  
common-mode noise. Conventional headphone ampli-  
fiers require a bulky DC-blocking capacitor between  
the headphone and the amplifier. DirectDrive produces  
a ground-referenced output from a single supply, elimi-  
nating the need for large DC-blocking capacitors,  
which saves cost, board space, and component height.  
The common-mode voltage sensing corrects for any  
difference between SGND of the amplifier and the  
headphone return. This feature minimizes ground-loop  
noise when the HP socket is used as a line out connec-  
tion to other grounded equipment, for example, a PC  
connected to a home hi-fi system.  
♦ Ground-Referenced Outputs Eliminate DC-Bias  
Voltages on Headphone Ground Pin  
♦ Common-Mode Voltage Sensing Eliminates  
Ground-Loop Noise  
♦ 96dB CMRR  
♦ No Degradation of Low-Frequency Response Due  
to Output Capacitors  
♦ 80mW per Channel into 16Ω  
♦ Low 0.002% THD+N  
♦ High 86dB PSRR  
♦ Integrated Click-and-Pop Suppression  
♦ 1.8V to 3.6V Single-Supply Operation  
♦ Low Quiescent Current  
♦ Low-Power Shutdown Mode  
♦ Short-Circuit and Thermal-Overload Protection  
The MAX4409 draws only 5mA of supply current, deliv-  
ers up to 80mW per channel into a 16Ω load, and has a  
low 0.002% THD+N. A high 86dB power-supply rejec-  
tion ratio allows this device to operate from noisy digital  
supplies without additional power-supply conditioning.  
The MAX4409 includes 8kꢀ ꢁSD protection on the  
headphone outputs. Comprehensive click-and-pop cir-  
cuitry eliminates audible clicks and pops on startup  
and shutdown. A low-power shutdown mode reduces  
supply current draw to only 6µA.  
♦
8kV ESD-Protected ꢀmplifier Outputs  
♦ ꢀvailable in a Space-Saving Package  
20-Pin Thin QFN (4mm x 4mm x 0.8mm)  
Ordering Information  
The MAX4409 operates from a single 1.8ꢀ to 3.6ꢀ sup-  
ply, has short-circuit and thermal overload protection,  
and is specified over the extended -40°C to +85°C tem-  
perature range. The MAX4409 is available in a tiny 20-  
pin thin QFN (4mm x 4mm x 0.8mm) package.  
PꢀRT  
TEMP RꢀNGE  
PIN-PꢀCKꢀGE  
MAX4409ꢁTP  
-40°C to +85°C  
20 Thin QFN-ꢁP*  
*EP = Exposed pad.  
Applications  
Functional Diagram  
Notebooks  
DirectDrive OUTPUTS  
Desktop PCs  
Cellular Phones  
PDAs  
ELIMINATE DC-BLOCKING  
CAPACITORS  
MAX4409  
LEFT  
AUDIO  
INPUT  
MP3 Players  
Tablet PCs  
SHDN  
Portable Audio ꢁquipment  
COM  
RIGHT  
AUDIO  
INPUT  
DirectDrive is a registered trademark of Maxim Integrated  
Products, Inc.  
COMMON-MODE  
SENSE INPUT ELIMINATES  
GROUND-LOOP NOISE  
Pin Configurations and Typical Application Circuit appear  
at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com  
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