Mono 1.5 W/Stereo 250 mW

Power Amplifier

SSM2250

Rev. A

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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 μA

PC99 compliant

Low distortion: 0.2% THD at 1.5 W

Wide bandwidth: 4 MHz

Unity-gain stable

APPLICATIONS

Desktop, portable, and palmtop computers

Sound cards

Communication headsets

2-way communications

Hand-held 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 AC97

codec, it provides a PC audio system that meets the PC99

requirements. The SSM2250 is compact and requires a mini-

mum of external components.

The SSM2250 features an audio amplifier capable of delivering

1.5 W of low distortion power into a mono 4 Ω bridge-tied load

(BTL) or 2 × 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 a 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 a 14-lead TSSOP and a

10-lead, surface mount MSOP package.

PIN CONFIGURATIONS

SSM2250

TOP VIEW

(Not to Scale)

LEFT IN

1

SHUTDOWN

2

SE/BTL

3

GND

4

RIGHT IN

5

LEFT OUT/BTL–

BTL+

BYPASS

RIGHT OUT

10

9

8

7

6

Figure 1. 10-Lead MSOP Pin Configuration

(RM Suffix)

NC

LEFT IN

SHUTDOWN

SE/BTL

+GND

RIGHT IN

NC

114

78

SSM2250

NC

LEFT OUT/BTL

BTL+

BYPASS

RIGHT OUT

NC

NC = NO CONNECT

Figure 2. 14-Lead TSSOP Pin Configuration

(RU Suffix)

FUNCTIONAL BLOCK DIAGRAM

A1

A2

A3

LEFT SE/

MONO BTL

OUT–

MONO BTL

OUT+

RIGHT

SE OUT

BTL/SE

SELECT

SHUTDOWN

CLICK AND POP

REDUCTION

BIAS

SWITCHING

CIRCUITRY

LEFT IN

BYPASS CAP

RIGHT IN

GND

Figure 3.