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SSM2211_04

Low Distortion 1.5 Watt Audio Power Amplifier

Analog Devices 

FEATURES

1.5 W output1

Differential (BTL2) output

Single-supply operation: 2.7 V to 5.5 V

Functions down to 1.75 V

Wide bandwidth: 4 MHz

Highly stable, phase margin: >80 degrees

Low distortion: 0.2% THD @ 1 W output

Excellent power-supply rejection

APPLICATIONS

Portable computers

Personal wireless communicators

Hands-free telephones

Speaker phones

Intercoms

Musical toys and talking games

GENERAL DESCRIPTION

The SSM22113 is a high performance audio amplifier that

delivers 1 W rms of low distortion audio power into a bridge-

connected 8 Ω speaker load (or 1.5 W rms into 4 Ω load). It

operates over a wide temperature range and is specified for

single-supply voltages between 2.7 V and 5.5 V. When oper-

ating from batteries, it continues to operate down to 1.75 V.

This makes the SSM2211 the best choice for unregulated

applications, such as toys and games. Featuring a 4 MHz

bandwidth and distortion below 0.2% THD @ 1 W, superior

performance is delivered at higher power or lower speaker

load impedance than competitive units.

The low differential dc output voltage results in negligible

losses in the speaker winding, and makes high value dc

blocking capacitors unnecessary. Battery life is extended by

using shutdown mode, which typically reduces quiescent

current drain to 100 nA.

Low Distortion 1.5 Watt

Audio Power Amplifier

SSM2211

FUNCTIONAL BLOCK DIAGRAM

IN–

VOUTA

IN+

BYPASS

SHUTDOWN

VOUTB

BIAS

V– (GND)

Figure 1.

SSM2211

The SSM2211 is designed to operate over the −20°C to +85°C

temperature range. The SSM2211 is available in SOIC-8 and

LFCSP (lead frame chip scale) surface mount packages. The

advanced mechanical packaging of the SSM2211CP ensures

lower chip temperature and enhanced performance relative to

standard packaging options.

Applications include personal portable computers, hands-free

telephones and transceivers, talking toys, intercom systems, and

other low voltage audio systems requiring 1 W output power.

1 1.5 W @ 4 Ω 25°C ambient, < 1% THD, 5 V supply, 4-layer PCB.

2 Bridge-tied load.

3 Protected by U.S. Patent No. 5,519,576.

Rev. C

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

www.analog.com

Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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