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SSM2315CBZ-REEL71 PDF预览

SSM2315CBZ-REEL71

更新时间: 2024-11-03 12:19:11
品牌 Logo 应用领域
亚德诺 - ADI 音频放大器
页数 文件大小 规格书
16页 440K
描述
Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

SSM2315CBZ-REEL71 数据手册

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Filterless, High Efficiency,  
Mono 3 W Class-D Audio Amplifier  
SSM2315  
The SSM2315 features a high efficiency, low noise modulation  
scheme that requires no external LC output filters. The modulation  
continues to provide high efficiency even at low output power.  
It operates with 93% efficiency at 1.4 W into 8 Ω or 85% efficiency  
at 3 W into 3 Ω from a 5.0 V supply and has an SNR of >103 dB.  
Spread-spectrum pulse density modulation is used to provide  
lower EMI-radiated emissions compared with other Class-D  
architectures.  
FEATURES  
Filterless Class-D amplifier with Σ-Δ modulation  
No sync necessary when using multiple Class-D amplifiers  
from Analog Devices, Inc.  
3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply  
with <1% total harmonic distortion (THD + N)  
93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker  
>103 dB signal-to-noise ratio (SNR)  
Single-supply operation from 2.5 V to 5.5 V  
20 nA ultralow shutdown current  
Short-circuit and thermal protection  
Available in 9-ball, 1.5 mm × 1.5 mm WLCSP  
Pop-and-click suppression  
Built-in resistors reduce board component count  
Default fixed 6 dB or user adjustable gain setting  
The SSM2315 has a micropower shutdown mode with a typical  
shutdown current of 20 nA. Shutdown is enabled by applying  
SD  
a logic low to the  
pin.  
The device also includes pop-and-click suppression circuitry.  
This suppression circuitry minimizes voltage glitches at the  
output during turn-on and turn-off, reducing audible noise  
on activation and deactivation.  
APPLICATIONS  
Mobile phones  
MP3 players  
Portable gaming  
Portable electronics  
Educational toys  
The fully differential input of the SSM2315 provides excellent  
rejection of common-mode noise on the input. Input coupling  
capacitors can be omitted if the dc input common-mode voltage  
is approximately VDD/2.  
The default gain of the SSM2315 is 6 dB, but users can reduce the  
gain by using a pair of external resistors (see the Gain section).  
GENERAL DESCRIPTION  
The SSM2315 is a fully integrated, high efficiency, Class-D audio  
amplifier. It is designed to maximize performance for mobile  
phone applications. The application circuit requires a minimum  
of external components and operates from a single 2.5 V to 5.5 V  
supply. It is capable of delivering 3 W of continuous output power  
with <1% THD + N driving a 3 Ω load from a 5.0 V supply.  
The SSM2315 is specified over the industrial temperature range of  
−40°C to +85°C. It has built-in thermal shutdown and output  
short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm  
wafer level chip scale package (WLCSP).  
FUNCTIONAL BLOCK DIAGRAM  
0.1µF  
10µF  
VBATT  
2.5V TO 5.5V  
VDD  
SSM2315  
160k  
47nF*  
80kΩ  
80kΩ  
IN+  
IN–  
OUT+  
OUT–  
AUDIO IN+  
AUDIO IN–  
MODULATOR  
FET  
DRIVER  
(Σ-Δ)  
47nF*  
160kΩ  
SD  
INTERNAL  
OSCILLATOR  
POP/CLICK  
SUPPRESSION  
BIAS  
SHUTDOWN  
GND  
*INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE  
VOLTAGE IS APPROXIMATELY V /2.  
DD  
Figure 1.  
Rev. A  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  
 

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