SSM2211x

Manufacturer Part NumberSSM2211x
DescriptionLow Distortion 1.5 Watt Audio Power Amplifier
ManufacturerAnalog Devices
SSM2211x datasheet
 


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FEATURES
1
1.5 Watt Output
2
Differential (BTL
)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
www.DataSheet4U.com
APPLICATIONS
Portable Computers
Personal Wireless Communicators
Hands-Free Telephones
Speakerphones
Intercoms
Musical Toys and Speaking Games
GENERAL DESCRIPTION
The SSM2211 is a high performance audio amplifier that delivers 1
W RMS of low distortion audio power into a bridge-connected 8
speaker load, (or 1.5 W RMS into 4
temperature range and is specified for single-supply voltages between
2.7 V 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, distortion below 0.2 % THD @ 1 W, and the
patented Thermal Coastline leadframe, superior performance is de-
livered at higher power or lower speaker load impedance than com-
petitive units. The advanced mechanical packaging of the SSM2211
gives lower chip temperature, which ensures highly reliable operation
and enhanced trouble free life.
*Protected by U.S. Patent No. 5,519,576
1
1.5 W @ 4 , +25 C ambient, < 1% THD, 5 V supply, 4 layer PCB.
2
Bridge Tied Load
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.
SHUTDOWN
The low differential dc output voltage results in negligible losses
in the speaker winding, and makes high value dc blocking capaci-
tors unnecessary. Battery life is extended by using the Shutdown
load). It operates over a wide
mode, which reduces quiescent current drain to typically 100 nA.
The SSM2211 is designed to operate over the –20 C to +85 C
temperature range. See Figure 49 for information on the Thermal
Coastline lead frame. The SSM2211 is available in an SO-8 sur-
face mount package. DIP samples are available; you should request
a special quotation on production quantities. An evaluation 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.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Low Distortion 1.5 Watt
Audio Power Amplifier
SSM2211*
FUNCTIONAL BLOCK DIAGRAM
V +
IN –
IN +
BYPASS
BIAS
V – (GND)
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1997
V
A
OUT
V
B
OUT

SSM2211x Summary of contents

  • Page 1

    ... +25 C ambient, < 1% THD supply, 4 layer PCB. 2 Bridge Tied Load 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 ...

  • Page 2

    SSM2211–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter GENERAL CHARACTERISTICS Differential Output Offset Voltage Output Impedence SHUTDOWN CONTROL Input Voltage High Input Voltage Low POWER SUPPLY Power Supply Rejection Ratio www.DataSheet4U.com Supply Current Supply Current, Shutdown Mode DYNAMIC PERFORMANCE Gain Bandwidth Phase Margin AUDIO ...

  • Page 3

    ABSOLUTE MAXIMUM RATINGS Supply Voltage Input ...

  • Page 4

    SSM2211–Typical Performance Characteristics (BTL 0 0 ...

  • Page 5

    3. (BTL FREQUENCY = 20Hz 0 0.1 0.01 20n 0.1 P – W OUTPUT Figure 13. THD+N vs. ...

  • Page 6

    SSM2211–Typical Performance Characteristics SINGLE ENDED 0 1000 250mW O 0.1 R ...

  • Page 7

    LOAD RESISTANCE – Figure 31. P vs. Load www.DataSheet4U.com OUTPUT Resistance 3.3V DD SAMPLE SIZE = ...

  • Page 8

    ... The SSM2211 can achieve 1 W continuous output into 8 , even at ambient temperatures up to +85 C. This is due to a propri- etary 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 ...

  • Page 9

    Driving a speaker differentially from a bridged output offers an- other advantage in that it eliminates the need for an output cou- pling capacitor to the load single supply application, the quiescent voltage at the output is 1/2 ...

  • Page 10

    SSM2211 1 1.0 0 0.5 www.DataSheet4U.com OUTPUT POWER – W Figure 41. Power Dissipation vs. Output Power with Because the efficiency of a bridged output ...

  • Page 11

    To find the minimum supply voltage needed to achieve a speci- fied maximum undistorted output power, simply use Figure 43. For example, an application requires only 500 output for an 8 speaker. With the speaker connected in ...

  • Page 12

    SSM2211 For an application where and C midrail bypass capacitor should be at least 0 mini- B mize start-up popping noise. SSM2211 Amplifier Design Example Given: Maximum Output Power 1 W Input ...

  • Page 13

    Equation 4. For a speaker load 470 F, this results in a –3 dB frequency of 42 Hz. Because the power of a single ended ...

  • Page 14

    SSM2211 square cm of copper area to the ground pins recommended that the solder mask and/or silk screen on the PCB traces adja- cent to the SSM2211 pins be deleted, thus reducing further the junction to ambient thermal ...

  • Page 15

    REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead SOIC (S0-8) 0.1968 (5.00) 0.1890 (4.80 0.1574 (4.00) 0.2440 (6.20 0.1497 (3.80) 0.2284 (5.80) PIN 1 0.0688 (1.75) 0.0196 (0.50) 0.0098 (0.25) 0.0532 (1.35) ...

  • Page 16

    www.DataSheet4U.com –16– ...