SSM2250_05 Datasheet, PDF (1/12 Pages) Analog Devices – Mono 1.5 W/Stereo 250 mW Power Amplifier

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.
Mono 1.5 W/Stereo 250 mW
Power Amplifier
SSM2250
PIN CONFIGURATIONS
LEFT IN 1
10 LEFT OUT/BTL–
SHUTDOWN 2 _SSM2250 9 V_DD
SE/BTL 3 TOP VIEW 8 BTL+
GND 4 ^{(Not to Scale)} 7 BYPASS
RIGHT IN 5
6 RIGHT OUT
Figure 1. 10-Lead MSOP Pin Configuration
(RM Suffix)
NC
LEFT IN
SHUTDOWN
SE/BTL
+GND
RIGHT IN
NC
1
14
SSM2250
7
8
NC
LEFT OUT/BTL
V_DD
BTL+
BYPASS
RIGHT OUT
NC
NC = NO CONNECT
Figure 2. 14-Lead TSSOP Pin Configuration
(RU Suffix)
FUNCTIONAL BLOCK DIAGRAM
LEFT IN
A1
V_DD
LEFT SE/
MONO BTL
OUT–
BYPASS CAP
RIGHT IN
A2
MONO BTL
OUT+
V_DD
A3
RIGHT
SE OUT
V_DD
GND
CLICK AND POP
REDUCTION
BIAS
SWITCHING
CIRCUITRY
Figure 3.
BTL/SE
SELECT
SHUTDOWN
Rev. A
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