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SSM2211-SSM2211.
Low Distortion, 1.5 Watt Audio Power Amplifier
FUNCTIONAL BLOCK DIAGRAMREV.B
Low Distortion 1.5 Watt
Audio Power Amplifier
FEATURES
1.5 W Output1
Differential (BTL2) Output
Single-Supply Operation: 2.7 V to 5.5 V
Functions Down to 1.75 V
Wide Bandwidth: 4 MHz
Highly Stable, Phase Margin: >80 Degrees
Low Distortion: 0.2% THD @ 1 W Output
Excellent Power Supply Rejection
APPLICATIONS
Portable Computers
Personal Wireless Communicators
Hands-Free Telephones
Speakerphones
Intercoms
Musical Toys and Speaking Games
GENERAL DESCRIPTIONThe SSM2211 is a high-performance audio amplifier that delivers
1 W RMS of low distortion audio power into a bridge-connected
8 W speaker load, (or 1.5 W RMS into 4 W load). It operates
over a wide temperature range and is specified for single-supply
voltages between 2.7V and 5.5 V. When operating from batteries,
it will continue to operate down to 1.75 V. This makes the
SSM2211 the best choice for unregulated applications such as toys
and games. Featuring a 4 MHz bandwidth and distortion below
0.2 % THD @ 1 W, superior performance is delivered at higher
power or lower speaker load impedance than competitive units.
The low differential dc output voltage results in negligible losses
in the speaker winding, and makes high value dc blocking ca-
pacitors unnecessary. Battery life is extended by using the
Shutdown mode, which reduces quiescent current drain to
typically 100 nA.
*. Patent No. 5,519,576
NOTES1.5 W @ 4 W, 25∞C ambient, <1% THD, 5 V supply, 4 layer PCB.Bridge Tied Load
The SSM2211 is designed to operate over the –20∞C to +85∞C
temperature range. The SSM2211 is available in SO-8 and
LFCSP (Lead Frame Chip Scale Package) surface mount
packages. The SO-8 features the patented Thermal Coastline
lead frame (see Figure 12). The advanced mechanical packaging
of the SSM2211 ensures lower chip temperature and enhanced
performance relative to standard packaging options. An evalua-
tion board is available upon request of your local Analog Device
sales office.
Applications include personal portable computers, hands-free
telephones and transceivers, talking toys, intercom systems and
other low voltage audio systems requiring 1 W output power.
SSM2211–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
(VS = 5.0 V, TA = 25�C, RL = 8 �, CB = 0.1 �F, VCM = VD/2, unless otherwise noted.)
(VS = 3.3 V, TA = 25�C, RL = 8 �, CB = 0.1�F, VCM = VD/2, unless otherwise noted.)
(VS = 2.7 V, TA = 25�C, RL = 8 �, CB = 0.1 �F, VCM = VS/2, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS1, 2Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VDD
Common Mode Input Voltage. . . . . . . . . . . . . . . . . . . . . . VDD
ESD Susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 V
Storage Temperature Range. . . . . . . . . . . . �65∞C to +150∞C
Operating Temperature Range. . . . . . . . . . . �20∞C to +85∞C
Junction Temperature Range. . . . . . . . . . . . �65∞C to +165∞C
Lead Temperature Range (Soldering, 60 sec). . . . . . . . 300∞C
NOTES
1Absolute maximum ratings apply at 25∞C, unless otherwise noted.
2Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
NOTESFor the SOIC package, qJA is measured with the device soldered to a 4-layer
printed circuit board.For the LFCSP package, qJA is measured with exposed lead frame soldered to
the printed circuit board.
PIN CONFIGURATIONS
8-Lead SOIC
(SO-8)
8-Lead LFCSP
(CP-8)
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the SSM2211 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.
ORDERING GUIDE
TPC 1.THD+N vs. Frequency
TPC 4.THD+N vs. Frequency
TPC 7.THD+N vs. POUTPUT
TPC 3.THD+N vs. Frequency
TPC 6.THD+N vs. Frequency
TPC 9.THD+N vs. POUTPUT
TPC 2.THD+N vs. Frequency
TPC 5.THD+N vs. Frequency
TPC 8.THD+N vs. POUTPUT
SSM2211–Typical Performance Characteristics
TPC 10.THD+N vs. Frequency
TPC 13.THD+N vs. POUTPUT
TPC 16.THD+N vs. Frequency
TPC 12.THD+N vs. Frequency
TPC 15.THD+N vs. Frequency
TPC 18.THD+N vs. Frequency
TPC 11.THD+N vs. Frequency
TPC 14.THD+N vs. POUTPUT
TPC 17.THD+N vs. Frequency
TPC 19.THD+N vs. POUTPUT
TPC 22.THD+N vs. Frequency
TPC 25.THD+N vs. POUTPUT
TPC 21.THD+N vs. POUTPUT
TPC 24.THD+N vs. Frequency
TPC 27.THD+N vs. POUTPUT
TPC 20.THD+N vs. POUTPUT
TPC 23.THD+N vs. Frequency
TPC 26.THD+N vs. POUTPUT
SSM2211
TPC 28.Maximum Power Dissipation
vs. Ambient Temperature
TPC 31.POUTPUT vs. Load
Resistance
TPC 34.Output Offset Voltage
Distribution
TPC 30.Supply Current vs.
Supply Voltage
TPC 33.Output Offset Voltage
Distribution
TPC 36.Supply Current Distribution
TPC 29.Supply Current vs.
Shutdown Voltage
TPC 32.Gain, Phase vs.
Frequency (Single Amplifier)
TPC 35.Output Offset Voltage
Distribution
SSM2211ration output to which a speaker can be connected. This bridge
configuration offers the advantage of a more efficient power trans-
fer from the input to the speaker. Because both outputs are sym-
metric, the dc bias at Pins 5 and 8 are exactly equal, resulting in
zero dc differential voltage across the outputs. This eliminates the
need for a coupling capacitor at the output.
Thermal Performance—SOICThe SSM2211 can achieve 1W continuous output into 8W in
SOIC, even at ambient temperatures up to 85∞C. This is due to a
proprietary SOIC package from Analog Devices that makes use of
an internal structure called a Thermal Coastline. The Thermal
Coastline provides a more efficient heat dissipation from the die
than in standard SOIC packages. This increase in heat dissipation
allows the device to operate in higher ambient temperatures or at
higher continuous output currents without overheating the die.
For a standard SOIC package, typical junction to ambient
temperature thermal resistance (�JA) is 158∞C/W. In a Thermal
Coastline SOIC package, �JA is 98∞C/W. Simply put, a die in a
Thermal Coastline package will not get as hot as a die in a stan-
dard SOIC package at the same current output.
Because of the large amounts of power dissipated in a speaker
amplifier, competitor’s parts operating from a 5V supply can
only drive 1W into 8W in ambient temperatures less than
44∞C, or 111∞F. With the Thermal Coastline SOIC package, the
SSM2211 can drive an 8W speaker with 1W from a 5V supply
with ambient temperatures as high as 85∞C (185∞F), without a
heat sink or forced air flow.
Thermal Performance—LFCSPThe addition of the LFCSP to the Analog Devices’ package
portfolio offers the SSM2211 user even greater choice when
considering thermal performance criteria. For the 8-lead 3 mm
� 3 mm LFCSP the �JA is 50∞C/W. This is a significant perfor-
mance improvement over most other packaging options and even
betters the thermal performance of the SOIC with Thermal
Coastline lead frame.
PRODUCT OVERVIEWThe SSM2211 is a low distortion speaker amplifier that can run
from a 1.7V to 5.5V supply. It consists of a rail-to-rail input
and a differential output that can be driven within 400mV of
either supply rail while supplying a sustained output current of
350mA. The SSM2211 is unity-gain stable, requiring no exter-
nal compensation capacitors, and can be configured for gains of
up to 40dB. Figure 1 shows the simplified schematic.
SHUTDOWN
VO1
VIN
20k�0.1�F
VO2Figure 1.Simplified Schematic
Pin 4 and Pin 3 are the inverting and noninverting terminals to A1.
An offset voltage is provided at Pin 2, which should be connected
to Pin 3 for use in single supply applications. The output of A1
appears at Pin 5. A second op amp, A2, is configured with a fixed
gain of AV=–1 and produces an inverted replica of Pin 5 at Pin8.
The SSM2211 outputs at Pins 5 and 8 produce a bridged configu-
TPC 37.PSRR vs. Frequency
