Low Distortion, 1.5 W Audio

Power Amplifier

Data Sheet

SSM2211

Rev. F

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FEATURES

1.5 W output with THD + N < 1%

Differential bridge-tied load 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°

Low distortion: 0.2% THD + N at 1 W output

Excellent power supply rejection

APPLICATIONS

Portable computers

Personal wireless communicators

Hands-free telephones

Speaker phones

Intercoms

Musical toys and talking games

FUNCTIONAL BLOCK DIAGRAM

IN–

IN+

SHUTDOWN

BYPASS

V– (GND)

BIAS

SSM2211

Figure 1.

GENERAL DESCRIPTION

The SSM22111 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 a 4 Ω load).

The SSM2211 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 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

+ N at 1 W, superior performance is delivered at higher power

or lower speaker load impedance than competitive units.

Furthermore, when the ambient temperature is at 25°C, THD +

delivers a 1.5 W output.

The low differential dc output voltage results in negligible

losses in the speaker winding and makes high value dc blocking

capacitors unnecessary. The battery life is extended by using

shutdown mode, which typically reduces quiescent current

drain to 100 nA.

The SSM2211 is designed to operate over the −40°C to +85°C

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

(narrow body) and LFCSP (lead frame chip scale) surface-

mount packages. The advanced mechanical packaging of the

LFCSP models 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

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