ANALOG DEVICES SSM2250 Service Manual
查询SSM2250RM-R2供应商
Mono 1.5 W/Stereo 250 mW
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 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 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.
LEFT IN
BYPASS CAP
RIGHT IN
V
G
N
Power Amplifier
SSM2250
PIN CONFIGURATIONS
1
LEFT IN
SE/BTL 3
GND 4
2
SSM2250
TOP VIEW
(Not to Scale)
SHUTDOWN
RIGHT IN 5
Figure 1. 10-Lead MSOP Pin Configuration
(RM Suffix)
114
NC
LEFT IN
SHUTDOWN
SE/BTL
+GND
RIGHT IN
SSM2250
78
NC
NC = NO CONNECT
Figure 2. 14-Lead TSSOP Pin Configuration
(RU Suffix)
FUNCTIONAL BLOCK DIAGRAM
A1
A3
CLICK AND POP
DD
REDUCTION
D
BIAS
Figure 3.
SWITCHING
CIRCUITRY
10
LEFT OUT/BTL–
9
V
DD
BTL+
8
7
BYPASS
6
RIGHT OUT
NC
LEFT OUT/BTL
V
DD
BTL+
BYPASS
RIGHT OUT
NC
A2
V
DD
-001
00359-002
LEFT SE/
MONO BTL
OUT–
MONO BTL
OUT+
V
DD
RIGHT
SE OUT
BTL/SE
SELECT
SHUTDOWN
00359-003
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.
Rev. A
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
SSM2250
TABLE OF CONTENTS
Features .............................................................................................. 1
Electrical Characteristics, V
= 2.7 V..........................................3
S
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics, V
= 5.0 V......................................... 3
S
REVISION HISTORY
6/05—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Updated Ordering Guide............................................................... 12
10/99—Revision 0: Initial Version
Absolute Maximum Ratings ............................................................4
ESD Caution...................................................................................4
Typical Perfor m a n c e Characte r i stics ..............................................5
Product Overview .............................................................................7
Typical Application .......................................................................7
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
Rev. A | Page 2 of 12
SSM2250
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS, VS = 5.0 V
VS = 5.0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
DEVICE CHARACTERISTICS
Output Offset Voltage V
Large Signal Voltage Gain A
Output Power P
OS
VO
OUT
BTL mode: RL = 8 Ω, THD < 1% 1,000 mW
Output Impedance Z
OUT
SHUTDOWN INPUT
Input Voltage High V
Input Voltage Low V
IH
IL
POWER SUPPLY
Supply Current I
S
SE mode 6.4 mA
Supply Current/Amplifier I
S
DYNAMIC PERFORMANCE
Slew Rate SR RL = 100 kΩ, CL = 50 pF 4 V/μs
Gain Bandwidth Product GBP 4 MHz
Phase Margin Фo 84 Degrees
NOISE PERFORMANCE
Voltage Noise Density e
n
BTL mode; AV = 2; BTL+ to BTL− 4 100 mV
RL = 2 kΩ 2 V/mV
SE mode: RL = 32 Ω, THD < 1% 90 mW
0.1 Ω
IS < 100 μA 2.0 V
IS > 1 mA 0.8 V
BTL mode 6.4 mA
60 μA
f = 1 kHz 45 nV/√Hz
ELECTRICAL CHARACTERISTICS, VS = 2.7 V
VS = 2.7 V, VCM = 1.35 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
DEVICE CHARACTERISTICS
Output Offset Voltage V
Large Signal Voltage Gain A
Output Power P
OS
VO
OUT
BTL mode: RL = 8 Ω, THD < 1% 300 mW
Output Impedance Z
OUT
SHUTDOWN INPUT
Input Voltage High V
Input Voltage Low V
IH
IL
POWER SUPPLY
Supply Current I
S
SE mode 6.4 mA
Supply Current/Amplifier I
S
DYNAMIC PERFORMANCE
Slew Rate SR RL = 100 kΩ, CL = 50 pF 4 V/μs
Gain Bandwidth Product GBP 4 MHz
Phase Margin Фo 84 Degrees
NOISE PERFORMANCE
Voltage Noise Density e
n
BTL mode; AV = 2; BTL+ to BTL− 4 100 mV
RL = 2 kΩ 2 V/mV
SE mode: RL = 32 Ω, THD < 1% 25 mW
0.1 Ω
IS < 100 μA 2.0 V
IS > 1 mA 0.8 V
BTL mode 6.4 mA
32 μA
f = 1 kHz 45 nV/√Hz
Rev. A | Page 3 of 12
SSM2250
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage 6 V
Differential Input Voltage
1
±5 V
Common-Mode Input Voltage ±6 V
ESD Susceptibility 2000 V
Storage Temperature Range
All Packages −65°C to +150°C
Operating Temperature Range
All Packages −40°C to +85°C
Junction Temperature Range
All Packages −65°C to +165°C
Lead Temperature Range (Soldering, 60 sec) 300°C
1
Differential input voltage or ±VS, whichever is lower.
ESD 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 this product 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.
Stresses above those indicated under Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 4.
Package Type θ
1
JA
θ
JC
Unit
10-Lead MSOP (RM) 200 44 °C/W
14-Lead TSSOP (RU) 180 35 °C/W
1
θJA is specified for worst-case conditions; that is, θJA is specified for the device
soldered in circuit board for surface mount packages.
Rev. A | Page 4 of 12
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