Low Distortion, 1.5 W Audio Power Amplifier Data Sheet SSM2211 FEATURES FUNCTIONAL BLOCK DIAGRAM 1.5 W output with THD + N < 1% Differential bridge-tied load output IN Single-supply operation: 2.7 V to 5.5 V V A OUT Functions down to 1.75 V IN+ Wide bandwidth: 4 MHz Highly stable phase margin: >80 Low distortion: 0.2% THD + N at 1 W output V B Excellent power supply rejection OUT BYPASS APPLICATIONS SHUTDOWN BIAS Portable computers SSM2211 Personal wireless communicators V (GND) Hands-free telephones Speaker phones Figure 1. Intercoms Musical toys and talking games GENERAL DESCRIPTION 1 The SSM2211 is a high performance audio amplifier that The low differential dc output voltage results in negligible delivers 1 W rms of low distortion audio power into a bridge- losses in the speaker winding and makes high value dc blocking connected 8 speaker load (or 1.5 W rms into a 4 load ). capacitors unnecessary. The battery life is extended by using shutdown mode, which typically reduces quiescent current The SSM2211 operates over a wide temperature range and is drain to 100 nA. specified for single-supply voltages between 2.7 V and 5.5 V. When operating from batteries, it continues to operate down to The SSM2211 is designed to operate over the 40C to +85C 1.75 V. This makes the SSM2211 the best choice for unregulated temperature range. The SSM2211 is available in 8-lead SOIC applications, such as toys and games. (narrow body) and LFCSP (lead frame chip scale) surface- mount packages. The advanced mechanical packaging of the Featuring a 4 MHz bandwidth and distortion below 0.2% total LFCSP models ensures lower chip temperature and enhanced harmonic distortion plus noise (THD + N) at 1 W, superior performance relative to standard packaging options. performance is delivered at higher power or lower speaker load impedance than competitive units. Furthermore, when the Applications include personal portable computers, hands-free ambient temperature is at 25C, THD + N < 1%, and V = 5 V telephones and transceivers, talking toys, intercom systems, and S on a 4-layer printed circuit board (PCB), the SSM2211 delivers other low voltage audio systems requiring 1 W output power. a 1.5 W output. 1 Protected by U.S. Patent No. 5,519,576. Rev. G Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20022016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com 00358-001SSM2211 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Bridged Output vs. Single-Ended Output Configurations ... 16 Applications ....................................................................................... 1 Speaker Efficiency and Loudness ............................................. 16 Functional Block Diagram .............................................................. 1 Power Dissipation....................................................................... 16 General Description ......................................................................... 1 Output Voltage Headroom ........................................................ 18 Revision History ............................................................................... 2 Automatic Shutdown-Sensing Circuit ..................................... 18 Specifications ..................................................................................... 4 Shutdown-Circuit Design Example ......................................... 19 Absolute Maximum Ratings ............................................................ 6 Start-Up Popping Noise ............................................................. 19 Thermal Resistance ...................................................................... 6 SSM2211 Amplifier Design Example .................................. 19 ESD Caution .................................................................................. 6 Single-Ended Applications ........................................................ 20 Pin Configurations and Function Descriptions ........................... 7 Driving Two Speakers Single-Endedly .................................... 20 Typical Performance Characteristics ............................................. 8 LFCSP PCB Considerations ...................................................... 21 Theory of Operation ...................................................................... 15 Outline Dimensions ....................................................................... 22 Thermal PerformanceLFCSP ................................................ 15 Ordering Guide .......................................................................... 22 Applications Information .............................................................. 16 REVISION HISTORY 5/16Rev. F to Rev. G Changes to Driving Two Speakers Single Endedly Section ...... 20 Changed Electrical Characteristics Section Heading to Changes to Figure 50...................................................................... 20 Specifications Section Heading....................................................... 4 Changes to Evaluation Board Section.......................................... 20 Changes to Table 5 ............................................................................ 6 Changes to Figure 51...................................................................... 20 Changes to Figure 3 .......................................................................... 7 Changes to Ordering Guide .......................................................... 22 Changed Product Overview Section Heading to Theory of Operation Section Heading ........................................................... 15 11/06Rev. C to Rev. D Changed Typical Applications Section Heading to Applications Updated Format .................................................................. Universal Information Section Heading ....................................................... 16 Changes to General Description ..................................................... 1 Updated Outline Dimensions ....................................................... 22 Changes to Electrical Characteristics ............................................. 3 Changes to Ordering Guide .......................................................... 22 Changes to Absolute Maximum Ratings ........................................ 5 Added Table 6 ....................................................................................6 12/13Rev. E to Rev. F Changes to Figure 32...................................................................... 11 Changes to Table 5 ............................................................................ 5 Changes to the Product Overview Section ................................. 14 Added Exposed Pad Notation, Pin Configurations and Function Changes to the Output Voltage Headroom Section................... 17 Descriptions Section ........................................................................ 6 Changes to the Start-Up Popping Noise Section........................ 18 Deleted Evaluation Board Section ................................................ 20 Changes to the Evaluation Board Section ................................... 20 Updated Outline Dimensions ....................................................... 21 Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 22 Changes to Ordering Guide .......................................................... 21 4/08Rev. D to Rev. E 10/04Rev. B to Rev. C Changes to Features .......................................................................... 1 Updated Format .................................................................. Universal Changes to General Description .................................................... 1 Changes to General Description ..................................................... 1 Changes to Supply Current in Table 1 and Table 2 ...................... 3 Changes to Table 5 ............................................................................. 4 Changes to Supply Current in Table 3 ........................................... 4 Deleted Thermal PerformanceSOIC Section ........................... 8 Changes to Absolute Maximum Ratings ....................................... 5 Changes to Figure 31...................................................................... 10 Changes to Figure 41 ...................................................................... 14 Changes to Figure 40...................................................................... 12 Changes to Equation 7, Equation 8, and Equation 10 ............... 16 Changes to Thermal PerformanceLFCSP Section ................. 13 Changes to Figure 47 ...................................................................... 17 Deleted Figure 52, Renumbered Successive Figures .................. 14 Changes to Automatic Shutdown-Sensing Circuit Section ...... 18 Deleted Printed Circuit Board LayoutSOIC Section ............. 14 Changes to SSM2211Amplifier Design Example Section ......... 19 Changes to Output Voltage Headroom Section ......................... 16 Rev. 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