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SSM2250_05

更新时间： 2024-11-03 04:02:47
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Mono 1.5 W/Stereo 250 mW Power Amplifier

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Mono 1.5 W/Stereo 250 mW  
Power Amplifier  
SSM2250  
PIN CONFIGURATIONS  
FEATURES  
Part of SoundMAX® audio solution for desktop computers  
Mono 1.5 W differential or stereo 250 mW output  
Single-supply operation: 2.7 V to 6 V  
Low shutdown current = 60 μA  
PC99 compliant  
LEFT IN  
SHUTDOWN  
SE/BTL  
1
2
3
4
5
10 LEFT OUT/BTL–  
9
8
7
6
V
DD  
SSM2250  
BTL+  
TOP VIEW  
(Not to Scale)  
GND  
BYPASS  
RIGHT OUT  
RIGHT IN  
Low distortion: 0.2% THD at 1.5 W  
Wide bandwidth: 4 MHz  
Figure 1. 10-Lead MSOP Pin Configuration  
(RM Suffix)  
Unity-gain stable  
1
14  
NC  
LEFT IN  
SHUTDOWN  
SE/BTL  
+GND  
RIGHT IN  
NC  
NC  
APPLICATIONS  
Desktop, portable, and palmtop computers  
Sound cards  
Communication headsets  
2-way communications  
Hand-held games  
LEFT OUT/BTL  
V
DD  
SSM2250  
BTL+  
BYPASS  
RIGHT OUT  
NC  
7
8
NC = NO CONNECT  
Figure 2. 14-Lead TSSOP Pin Configuration  
(RU Suffix)  
GENERAL DESCRIPTION  
The SSM2250 is intended for use in desktop computers that  
have basic audio functions. It is also ideal for any audio system  
that needs to provide both an internal monaural speaker and  
a stereo line or headphone output. Combined with an AC97  
codec, it provides a PC audio system that meets the PC99  
requirements. The SSM2250 is compact and requires a mini-  
mum of external components.  
FUNCTIONAL BLOCK DIAGRAM  
V
DD  
LEFT IN  
LEFT SE/  
MONO BTL  
OUT–  
A1  
BYPASS CAP  
MONO BTL  
OUT+  
The SSM2250 features an audio amplifier capable of delivering  
1.5 W of low distortion power into a mono 4 Ω bridge-tied load  
(BTL) or 2 × 90 mW into stereo 32 Ω single-ended load (SE)  
headphones. Both amplifiers provide rail-to-rail outputs for  
maximum dynamic range from a single supply. The balanced  
output provides maximum output from a 5 V supply and  
eliminates the need for a coupling capacitor.  
A2  
V
DD  
RIGHT IN  
RIGHT  
SE OUT  
A3  
SWITCHING  
CIRCUITRY  
BTL/SE  
SELECT  
The SSM2250 can automatically switch between an internal  
mono speaker and external headphones. The device can run  
from a single supply, ranging from 2.7 V to 6 V, with an active  
supply current of 9 mA typical. The ability to shut down the  
amplifiers (60 μA shutdown current) makes the SSM2250 an  
ideal speaker amplifier for battery-powered applications.  
V
DD  
CLICK AND POP  
REDUCTION  
BIAS  
SHUTDOWN  
GND  
Figure 3.  
The SSM2250 is specified over the industrial (−40°C to +85°C)  
temperature range. It is available in a 14-lead TSSOP and a  
10-lead, surface mount MSOP package.  
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  
registered trademarks are the 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  
© 2005 Analog Devices, Inc. All rights reserved.  
 
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