SSM2250 Analog Devices, SSM2250 Datasheet

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SSM2250

Manufacturer Part Number
SSM2250
Description
Mono 1.5 W/Stereo 250 mW Power Amplifier
Manufacturer
Analog Devices
Datasheet

Specifications of SSM2250

Case
TSSOP
Dc
00+

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a
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 AC’97 Codec it provides a
PC audio system that meets the PC 99 requirements. The SSM2250
is compact and requires a minimum of external components.
The SSM2250 features an audio amplifier capable of delivering
1.5 W of low distortion power into a mono 4
(BTL) or 2
headphones. Both amplifiers provide rail-to-rail outputs for maxi-
mum dynamic range from a single supply. The balanced output
provides maximum output from 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 A 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 14-lead TSSOP and 10-lead
MSOP surface mount packages.
SoundMax is a registered trademark of Analog Devices, Inc.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Part of SoundMax
Mono 1.5 W Differential or Stereo 250 mW Output
Single-Supply Operation: 2.7 V to 6 V
Low Shutdown Current = 60 A
PC 99 Compliant
Low Distortion: 0.2% THD at 1.5 W
Wide Bandwidth: 4 MHz
Unity-Gain Stable
APPLICATIONS
Desktop, Portable or Palmtop Computers
Sound Cards
Communication Headsets
2-Way Communications
Handheld Games
90 mW into stereo 32
®
Audio Solution for Desktop Computers
single-ended load (SE)
bridged-tied load
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
RIGHT IN
BYPASS
LEFT IN
GND
Mono 1.5 W/Stereo 250 mW
CAP
V
DD
Figure 1. Functional Block Diagram
SHUTDOWN
SHUTDOWN
RIGHT IN
RIGHT IN
LEFT IN
SE/BTL
LEFT IN
SE/BTL
PIN CONFIGURATIONS
CLICK AND POP
GND
GND
REDUCTION
World Wide Web Site: http://www.analog.com
NC
NC
BIAS
14-Lead TSSOP
10-Lead MSOP
NC = NO CONNECT
1
A1
2
3
4
5
(RM Suffix)
(RU Suffix)
1
SSM2250
7
A3
SSM2250
Power Amplifier
14
8
SWITCHING
CIRCUITRY
10
© Analog Devices, Inc., 1999
9
8
7
6
A2
V
DD
SSM2250
LEFT OUT/BTL–
V
BTL+
BYPASS
RIGHT OUT
NC
LEFT OUT/BTL
V
BTL
BYPASS
RIGHT OUT
NC
DD
DD
V
DD
LEFT SE/
MONO BTL
OUT–
MONO BTL
OUT+
RIGHT
SE OUT
BTL/SE
SELECT
SHUT-
DOWN

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SSM2250 Summary of contents

Page 1

... The ability to shut down the amplifiers, (60 A shutdown current) makes the SSM2250 an ideal speaker amplifier for battery-powered applications. The SSM2250 is specified over the industrial (– +85 C) temperature range available in 14-lead TSSOP and 10-lead MSOP surface mount packages. SoundMax is a registered trademark of Analog Devices, Inc. ...

Page 2

... SSM2250–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter DEVICE CHARACTERISTICS Output Offset Voltage Large Signal Voltage Gain Output Power Output Impedance SHUTDOWN INPUT Input Voltage High Input Voltage Low POWER SUPPLY Supply Current Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin ...

Page 3

... V Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . 6 V ESD Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 V Storage Temperature Range RM, RU Packages . . . . . . . . . . . . . . . . . . – +150 C Operating Temperature Range SSM2250 . . . . . . . . . . . . . . . . . . . . . . . . . . – +85 C Junction Temperature Range RM, RU Packages . . . . . . . . . . . . . . . . . . – +165 C Lead Temperature Range (Soldering, 60 sec 300 C NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...

Page 4

... SSM2250 BTL MODE OUT 0.1 20 100 1k FREQUENCY – Hz Figure 2. BTL Out THD + N vs. Frequency 2.7V S BTL MODE 0.25W OUT 0.1 20 100 1k FREQUENCY – Hz Figure 3. BTL Out THD + N vs. Frequency VARIES 2.7V S BTL MODE 1kHz 0.1 10m 100m OUTPUT POWER – W Figure 4. THD + N vs. Output Power ...

Page 5

... Figure 9. BTL Out THD + N vs. Output Power at 20 kHz REV MODE 20Hz 0.1 0. Figure 10. SE Out THD + N vs. Output Power MODE 20kHz 0.1 0. Figure 11. SE Out THD + N vs. Output Power at 20 kHz –5– SSM2250 100 200 OUTPUT POWER – mW 100 200 OUTPUT POWER – mW ...

Page 6

... Once a plug is inserted, this connection is broken. Referring to Figure 12, Pin 4 of the SSM2250 is connected to the normalizing pin for the right channel output. This is the pin in the headphone jack that will hit the ring on the headphone plug. ...

Page 7

... will create a corner frequency of 8 Hz. This is acceptable, as the PC 99 audio requirement specifies the com- puter audio system bandwidth kHz. Pin 10 on the SSM2250 provides the proper bias voltage for the amplifiers. A 0.1 F capacitor should be connected here to reduce sensitivity to noise on the power supply. A larger capaci- tor can be used should more rejection from power supply noise be required ...

Page 8

... It can be easily seen that power into a speaker can produce quite a bit of acoustic energy Shutdown Feature L The SSM2250 can be put into a low power consumption shut- down mode by connecting Pin SSM2250 has low supply current Pin 3 should be connected to ground for normal operation. Con- necting Pin ...

Page 9

... The AD1881 is an AC’97 Ver. 2.1 audio codec available from Analog Devices. The stereo output from the AD1881 is coupled into the SSM2250, which is used to drive a mono internal speaker and stereo headphones. The internal speaker switching is controlled by the SSM2250 through the normalizing pin on the headphone jack ...

Page 10

... SSM2250 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 10-Lead MSOP (RM Suffix) 0.124 (3.15) 0.112 (2.84 0.124 (3.15) 0.199 (5.05) 0.112 (2.84) 0.187 (4.75 PIN 1 0.0197 (0.50) BSC 0.122 (3.10) 0.110 (2.79) 0.038 (0.97) 0.043 (1.09) 0.030 (0.76) 0.037 (0.94) SEATING 0.006 (0.15) ...

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