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MAX9720 PDF预览

MAX9720

更新时间: 2024-11-10 14:57:47
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
21页 456K
描述
50mW、DirectDrive?、立体声耳机放大器,带有SmartSense?和关断

MAX9720 数据手册

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19-2859; Rev 0; 4/03  
50mW, DirectDrive, Stereo Headphone  
Amplifier with SmartSense and Shutdown  
General Description  
Features  
The MAX9720 stereo headphone amplifier combines  
Maxim’s DirectDrive architecture and SmartSense™, an  
automatic mono/stereo detection feature. Conventional  
headphone amplifiers require a bulky DC-blocking  
capacitor between the headphone and the amplifier.  
DirectDrive produces a ground-referenced output from  
a single supply, eliminating the need for large DC-  
blocking capacitors, saving cost, board space, and  
component height.  
DirectDrive Eliminates Bulky DC-Blocking  
Capacitors  
SmartSense Automatic Short Detection  
Low 5mA Quiescent Current  
Fixed Gain Eliminates External Feedback Network  
MAX9720A: -1V/V  
MAX9720B: -1.41V/V  
50mW per Channel Output Power  
Ultra-Low 0.003% THD+N  
SmartSense automatically detects the presence of a  
short at either the left or right amplifier output. Under a  
fault condition, the shorted output is automatically dis-  
abled and the stereo input signal is automatically mixed  
and routed to the remaining active channel. This feature  
is useful in cell phone and PDA applications where a  
variety of headphone jacks with unknown loads can be  
inserted into the headphone jack socket. SmartSense  
prevents both damage to the amplifier and eliminates  
battery drain into a shorted load.  
High PSRR (92dB at 217Hz)  
Integrated Click-and-Pop Suppression  
1.8V to 3.6V Single-Supply Operation  
Thermal Overload Protection  
Available in Space-Saving Packages  
16-Bump UCSP (2mm x 2mm x 0.6mm)  
16-Pin TSSOP  
The MAX9720 delivers up to 50mW per channel into a  
16Ω load and has an ultra-low 0.003% THD+N. A high  
(92dB at 217kHz) power-supply rejection ratio (PSRR)  
allows the device to operate from noisy digital supplies  
without additional power conditioning. The gain of the  
MAX9720 is set internally, further reducing component  
count. Two gain options are available (-1V/V, MAX9720A  
and -1.41V/V, MAX9720B). The headphone outputs  
include a comprehensive click-and-pop circuitry that  
eliminates audible glitches on startup and shutdown. A  
shutdown mode provides a fast 250µs turn-on time.  
Ordering Information  
PIN/BUMP-  
PACKAGE  
GAIN  
(V/V)  
PART  
TEMP RANGE  
MAX9720AEBE-T -40oC to +85oC  
MAX9720BEBE-T -40oC to +85oC  
16 UCSP-16  
16 UCSP-16  
16 TSSOP  
-1  
-1.41  
-1  
MAX9720AEUE  
MAX9720BEUE  
-40oC to +85oC  
-40oC to +85oC  
16 TSSOP  
-1.41  
The MAX9720 operates from a single 1.8V to 3.6V  
supply and consumes only 5mA of supply current. The  
MAX9720 also features thermal overload protection,  
and is specified over the extended -40°C to +85°C tem-  
perature range. The MAX9720 is available in a tiny  
(2mm x 2mm x 0.6mm) 16-bump chip-scale package  
(UCSP™) and a 16-pin TSSOP package.  
Simplified Block Diagram  
3.6V TO 1.8V  
SUPPLY  
Applications  
MAX9720  
R
IN  
PDAs  
Smart Phones  
R
OUT  
Cellular Phones  
MP3 Players  
Notebook PCs  
Tablet PCs  
HPS  
Portable Audio Equipment  
MODE1  
MODE2  
ALERT  
+
SmartSense  
L
OUT  
SmartSense and UCSP are trademarks of Maxim Integrated  
Products, Inc.  
L
IN  
Pin Configuration and Typical Application Circuit appear at  
end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  

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