a
Mono 1.5 W/Stereo 250 mW
Power Amplifier
SSM2250
PIN CONFIGURATIONS
10-Lead MSOP
(RM Suffix)
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 A
PC 99 Compliant
Low Distortion: 0.2% THD at 1.5 W
Wide Bandwidth: 4 MHz
Unity-Gain Stable
LEFT IN
9
SSM2250
VDD
3
8
BTL+
GND
4
7
BYPASS
RIGHT IN
5
6
RIGHT OUT
14-Lead TSSOP
(RU Suffix)
NC
LEFT IN
SHUTDOWN
SE/BTL
؉GND
RIGHT IN
NC
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 AC’97 Codec it provides a
PC audio system that meets the PC 99 requirements. The SSM2250
is compact and requires a minimum of external components.
The SSM2250 is specified over the industrial (–40°C to +85°C)
temperature range. It is available in 14-lead TSSOP and 10-lead
MSOP surface mount packages.
2
SE/BTL
GENERAL DESCRIPTION
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.
10 LEFT OUT/BTL–
SHUTDOWN
APPLICATIONS
Desktop, Portable or Palmtop Computers
Sound Cards
Communication Headsets
2-Way Communications
Handheld Games
The SSM2250 features an audio amplifier capable of delivering
1.5 W of low distortion power into a mono 4 Ω bridged-tied load
(BTL) or 2 ϫ 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 5 V supply and eliminates the
need for a coupling capacitor.
1
1
NC
LEFT OUT/BTL
VDD
BTL؉
BYPASS
RIGHT OUT
NC
14
SSM2250
7
8
NC = NO CONNECT
VDD
LEFT IN
LEFT SE/
MONO BTL
OUT–
A1
BYPASS
CAP
MONO BTL
OUT+
A2
VDD
RIGHT IN
RIGHT
SE OUT
A3
SWITCHING
CIRCUITRY
VDD
GND
CLICK AND POP
REDUCTION
BIAS
BTL/SE
SELECT
SHUTDOWN
Figure 1. Functional Block Diagram
SoundMax is a registered trademark of Analog Devices, Inc.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
