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.

a

SSM2250

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

Mono 1.5 W/Stereo 250 mW

Power Amplifier

PIN CONFIGURATIONS

10-Lead MSOP

(RM Suffix)

RIGHT IN

RIGHT OUT

56

GND

BYPASS

47

LEFT IN

SHUTDOWN

LEFT OUT/BTL–

1

2

3

10

9

8

BTL+

SSM2250

SE/BTL

FEATURES

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

APPLICATIONS

Desktop, Portable or Palmtop Computers

Sound Cards

Communication Headsets

2-Way Communications

Handheld Games

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 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 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

90 mW into stereo 32

Ω single-ended load (SE)

headphones. Both amplifiers provide rail-to-rail outputs for maxi-

mum dynamic range from a single supply. The balanced output

provides maximum output from 5 V supply and eliminates the

need for a coupling capacitor.

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.

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.

LEFT IN

LEFT SE/

MONO BTL

OUT–

MONO BTL

OUT+

RIGHT

SE OUT

RIGHT IN

BYPASS

CAP

CLICK AND POP

REDUCTION

BIAS

GND

SHUT-

DOWN

SWITCHING

CIRCUITRY

BTL/SE

SELECT

A1

A2

A3

Figure 1. Functional Block Diagram

SoundMax is a registered trademark of Analog Devices, Inc.

14-Lead TSSOP

(RU Suffix)

NC

LEFT IN

SHUTDOWN

GND

RIGHT IN

NC

LEFT OUT/BTL

BTL

NC

RIGHT OUT

NC

BYPASS

114

78

SSM2250

NC = NO CONNECT

SE/BTL