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MAX9705_09

更新时间： 2024-09-24 11:14:15
品牌 Logo 应用领域
美信 - MAXIM 音频放大器
页数 文件大小 规格书
18页 472K
描述
2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier

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MAX9705_09 数据手册

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19-3405; Rev 3; 5/09  
2.3W, Ultra-Low-EMI, Filterless,  
Class D Audio Amplifier  
MAX9705  
General Description  
Features  
o Filterless Amplifier Passes FCC-Radiated  
The MAX9705 3rd-generation, ultra-low EMI, mono, Class  
D audio power amplifier provides Class AB performance  
with Class D efficiency. The MAX9705 delivers 2.3W into  
a 4Ω load and offers efficiencies above 85%. Active  
emissions limiting (AEL) circuitry greatly reduces EMI by  
actively controlling the output FET gate transitions under  
all possible transient output-voltage conditions. AEL pre-  
vents high-frequency emissions resulting from conven-  
tional Class D free-wheeling behavior in the presence of  
an inductive load. Zero dead time (ZDT) technology  
maintains state-of-the-art efficiency and THD+N perfor-  
mance by allowing the output FETs to switch simultane-  
ously without cross-conduction. A patented spread-  
spectrum modulation scheme eliminates the need for out-  
put filtering found in traditional Class D devices. These  
design concepts reduce an application’s component  
count and extend battery life.  
Emissions Standards with 24in of Cable  
o Unique Spread-Spectrum Mode and Active  
Emissions Limiting (AEL) Achieves Better than  
20dB Margin Under FCC Limits  
o Zero Dead Time (ZDT) H-Bridge Maintains State-  
of-the-Art Efficiency and THD+N  
o Simple Master-Slave Setup for Stereo Operation  
o Up to 90% Efficiency  
o 2.3W into 4Ω (1% THD+N)  
o Low 0.02% THD+N (P  
= 1W, V  
= 5.0V)  
OUT  
DD  
o High PSRR (75dB at 217Hz)  
o Integrated Click-and-Pop Suppression  
o Low Quiescent Current (5.4mA)  
o Low-Power Shutdown Mode (0.3µA)  
o Short-Circuit and Thermal-Overload Protection  
The MAX9705 offers two modulation schemes: a fixed-  
frequency (FFM) mode and a spread-spectrum (SSM)  
mode that further reduces EMI-radiated emissions due to  
the modulation frequency. The MAX9705 oscillator can  
be synchronized to an external clock through the SYNC  
input, allowing the switching frequency to be externally  
defined. The SYNC input also allows multiple MAX9705s  
to be cascaded and frequency locked, minimizing inter-  
ference due to clock intermodulation. The device utilizes  
a fully differential architecture, a full-bridged output, and  
comprehensive click-and-pop suppression. The gain of  
the MAX9705 is set internally (MAX9705A: 6dB,  
MAX9705B: 12dB, MAX9705C: 15.6dB, MAX9705D:  
20dB), further reducing external component count.  
o Available in Thermally Efficient, Space-Saving  
Packages  
10-Pin TDFN (3mm x 3mm x 0.8mm)  
12-Bump UCSP (1.5mm x 2mm x 0.6mm)  
o Pin-for-Pin Compatible with the MAX9700 and  
MAX9712  
Ordering Information  
PIN-  
TOP  
PART  
TEMP RANGE  
PACKAGE  
MARK  
MAX9705AETB+T  
MAX9705AEBC+T  
MAX9705BETB+T  
MAX9705BEBC+T  
-40oC to +85oC 10 TDFN  
-40oC to +85oC 12 UCSP  
-40oC to +85oC 10 TDFN  
-40oC to +85oC 12 UCSP  
ACY  
ACH  
ACX  
ACG  
The MAX9705 is available in 10-pin TDFN (3mm x 3mm x  
0.8mm), and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm)  
packages. The MAX9705 is specified over the extended  
-40°C to +85°C temperature range.  
Ordering Information continued at end of data sheet.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
Applications  
EMI Spectrum Diagram  
Cellular Phones  
PDAs  
MP3 Players  
Portable Audio  
50.0  
45.0  
40.0  
FCC EMI LIMIT  
35.0  
30.0  
25.0  
20.0  
15.0  
10.0  
5.0  
Selector Guide appears at end of data sheet.  
MAXIM'S NEW ULTRA-LOW  
OUTPUT SPECTRUM  
30.0  
60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0  
FREQUENCY (MHz)  
UCSP is a trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ 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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