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SSM2211_02

Low Distortion 1.5 Watt Audio Power Amplifier

Analog Devices 

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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

Speakerphones

Intercoms

Musical Toys and Speaking Games

Low Distortion 1.5 Watt

Audio Power Amplifier

SSM2211*

FUNCTIONAL BLOCK DIAGRAM

IN –

IN +

BYPASS

SHUTDOWN

BIAS

V– (GND)

VOUT A

VOUT B

GENERAL DESCRIPTION

The SSM2211 is a high-performance audio amplifier that delivers

1 W RMS of low distortion audio power into a bridge-connected

8 W speaker load, (or 1.5 W RMS into 4 W load). It operates

over a wide temperature range and is specified for single-supply

voltages between 2.7 V and 5.5 V. When operating from batteries,

it will continue 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 ca-

pacitors unnecessary. Battery life is extended by using the

Shutdown mode, which reduces quiescent current drain to

typically 100 nA.

The SSM2211 is designed to operate over the –20∞C to +85∞C

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

LFCSP (Lead Frame Chip Scale Package) surface mount

packages. The SO-8 features the patented Thermal Coastline

lead frame (see Figure 12). The advanced mechanical packaging

of the SSM2211 ensures lower chip temperature and enhanced

performance relative to standard packaging options. An evalua-

tion board is available upon request of your local Analog Device

sales office.

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.

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

NOTES

11.5 W @ 4 W, 25∞C ambient, <1% THD, 5 V supply, 4 layer PCB.

2Bridge Tied Load

REV. B

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. 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

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

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