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SSM2317-EVALZ

更新时间： 2024-11-03 04:02:47
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
20页 766K
描述
Filterless High Efficiency Mono 3 W Class-D Audio Amplifier

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Filterless High Efficiency  
Mono 3 W Class-D Audio Amplifier  
SSM2317  
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.  
FEATURES  
Filterless Class-D amplifier with Σ-Δ modulation  
Automatic level control (ALC) improves dynamic range and  
prevents clipping  
3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply  
with <10% total harmonic distortion (ALC off)  
700 mW into 8 Ω load at 4.2 V supply (ALC 80%)  
93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker  
>93 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 18 dB or user-adjustable gain setting  
The SSM2317 features a high efficiency, low noise modulation  
scheme that does not require any 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  
>93 dB. Spread-spectrum pulse density modulation is used to  
provide lower EMI radiated emissions compared with other  
Class-D architectures.  
Automatic level control (ALC) can be activated to suppress  
clipping and improve dynamic range. This feature only requires  
one external resistor tied to GND via the VTH pin and an  
activation voltage on the ALC_EN pin.  
The SSM2317 has a micropower shutdown mode with a typical  
shutdown current of 20 nA. Shutdown is enabled by applying  
APPLICATIONS  
Mobile phones  
SD  
a logic low to the  
pin.  
MP3 players  
The device also includes pop-and-click suppression circuitry. This  
minimizes voltage glitches at the output during turn-on and turn-  
off, reducing audible noise on activation and deactivation.  
Portable gaming  
Portable electronics  
Educational toys  
The default gain of the SSM2317 is 18 dB, but users can reduce the  
gain by using a pair of external resistors (see the Gain section).  
GENERAL DESCRIPTION  
The SSM2317 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  
The SSM2317 is specified over the commercial 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  
VBATT  
2.5V TO 5.5V  
10µF  
0.1µF  
VDD  
SSM2317  
1
1
80kΩ  
0.1µF  
10kΩ  
10kΩ  
IN+  
AUDIO IN+  
OUT+  
OUT–  
MODULATOR  
FET  
DRIVER  
(Σ-Δ)  
0.1µF  
IN–  
SD  
AUDIO IN–  
80kΩ  
INTERNAL  
OSCILLATOR  
POP-AND-CLICK  
SUPPRESSION  
BIAS  
ALC  
SHUTDOWN  
GND  
ALC_EN  
VTH  
R
TH  
ALC ENABLE  
1
INPUT CAPACITORS 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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