Analog Devices SSM2250 Datasheet
Mono 1.5 W/Stereo 250 mW
RIGHT IN
RIGHT OUT
56
GND
BYPASS
47
LEFT IN
SHUTDOWN
LEFT OUT/BTL–
V
DD
1
2
3
10
9
8 BTL+
SSM2250
SE/BTL
LEFT IN
LEFT SE/
MONO BTL
OUT–
MONO BTL
OUT+
RIGHT
SE OUT
V
DD
RIGHT IN
BYPASS
CAP
V
DD
CLICK AND POP
REDUCTION
BIAS
V
DD
GND
SHUTDOWN
SWITCHING
CIRCUITRY
BTL/SE
SELECT
A1
A2
A3
NC
LEFT IN
SHUTDOWN
1GND
RIGHT IN
NC
LEFT OUT/BTL
V
DD
BTL1
NC
RIGHT OUT
NC
BYPASS
114
78
SSM2250
NC = NO CONNECT
SE/BTL
a
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
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 Ω bridged-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 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 14-lead TSSOP and 10-lead
MSOP surface mount packages.
®
Audio Solution for Desktop Computers
Power Amplifier
SSM2250
PIN CONFIGURATIONS
10-Lead MSOP
(RM Suffix)
14-Lead TSSOP
(RU Suffix)
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.
Figure 1. Functional Block Diagram
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1999
SSM2250–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(VS = 5.0 V, VCM = 2.5 V, TA = 25ⴗC unless otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
DEVICE CHARACTERISTICS␣
Output Offset Voltage V
Large Signal Voltage Gain A
Output Power P
Output Impedance Z
OS
VO
OUT
OUT
BTL Mode; AV = 2; BTL+ to BTL– 4 100 mV
R
= 2 kΩ 2 V/mV
L
SE Mode: R
BTL Mode: R
= 32 Ω, THD < 1% 90 mW
L
= 8 Ω, THD < 1% 1,000 mW
L
0.1 Ω
SHUTDOWN INPUT
Input Voltage High V
Input Voltage Low V
IH
IL
I
< 100 µA 2.0 V
S
IS > 1 mA 0.8 V
POWER SUPPLY␣
Supply Current I
S
BTL Mode 6.4 mA
SE Mode 6.4 mA
Supply Current/Amplifier I
S
60 µA
DYNAMIC PERFORMANCE␣
Slew Rate SR R
= 100 kΩ, CL = 50 pF 4 V/µs
L
Gain Bandwidth Product GBP 4 MHz
Phase Margin Φo 84 Degrees
NOISE PERFORMANCE␣
Voltage Noise Density e
Specifications subject to change without notice.
n
f = 1 kHz 45 nV/√Hz
ELECTRICAL CHARACTERISTICS
(VS = 2.7 V, VCM = 1.35 V, TA = 25ⴗC unless otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
DEVICE CHARACTERISTICS␣
Output Offset Voltage V
Large Signal Voltage Gain A
Output Power P
Output Impedance Z
OS
VO
OUT
OUT
BTL Mode; AV = 2; BTL+ to BTL– 4 100 mV
R
= 2 kΩ 2 V/mV
L
SE Mode: R
BTL Mode: R
= 32 Ω, THD < 1% 25 mW
L
= 8 Ω, THD < 1% 300 mW
L
0.1 Ω
SHUTDOWN INPUT
Input Voltage High V
Input Voltage Low V
IH
IL
I
< 100 µA 2.0 V
S
IS > 1 mA 0.8 V
POWER SUPPLY␣
Supply Current I
S
BTL Mode 6.4 mA
SE Mode 6.4 mA
Supply Current/Amplifier I
S
32 µA
DYNAMIC PERFORMANCE␣
Slew Rate SR R
= 100 kΩ, CL = 50 pF 4 V/µs
L
Gain Bandwidth Product GBP 4 MHz
Phase Margin Φo 84 Degrees
NOISE PERFORMANCE␣
Voltage Noise Density e
Specifications subject to change without notice.
n
f = 1 kHz 45 nV/√Hz
–2– REV. 0
ABSOLUTE MAXIMUM RATINGS
WARNING!
ESD SENSITIVE DEVICE
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Differential Input Voltage
2
. . . . . . . . . . . . . . . . . . . . . . . . ±5 V
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . ±6 V
ESD Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 V
Storage Temperature Range
RM, RU Packages . . . . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
SSM2250 . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature Range
RM, RU Packages . . . . . . . . . . . . . . . . . . –65°C to +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; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2
Differential Input Voltage or ± VS, whichever is lower.
1
Package Type
10-Lead MSOP (RM) 200 44 °C/W
14-Lead TSSOP (RU) 180 35 °C/W
NOTE
1
θJA is specified for worst-case conditions, i.e., θ
in circuit board for surface mount packages.
ORDERING GUIDE
Temperature Package Package
Model Range Description Option
SSM2250RM –40°C to +85°C 10-Lead MSOP RM-10
SSM2250RU –40°C to +85°C 14-Lead TSSOP RU-14
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the SSM2250 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
SSM2250
1
JA
JC
is specified for device soldered
JA
Unit
–3–REV. 0
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