Eval-SSM2301| Application Note
Evaluation Board for Filterless Class-D Audio Amplifier EVAL-SSM2301
FEATURES
Highly configurable DIP switch settings: gain adjustment, input configuration, and shutdown control Optional dc power supply jack (accepts 2.5 V to 5 V) Single-ended and differential input capability Multiple output interface connection terminals
GENERAL DESCRIPTION
The SSM2301 is a single-chip, single-channel, Class-D audio amplifier. It is a fully integrated chip, which means that the application circuit requires a minimum of external components. It comes with a differential mode input port and a high efficiency H-bridge at the output. When compared to a half-bridge output stage, a full H-bridge enables direct coupling of the audio power signal to the loudspeaker, doubling the output voltage swing and eliminating the need for a large output coupling capacitor. Another benefit of a full H-bridge is an increase of the maximum output power by 4 when compared to a half bridge under the same load impedance. These benefits are particularly useful for low voltage, battery-powered portable electronics where energy and space are limited. The differential mode input stage allows for cancelling of common-mode noise leading to a superior CMRR.
Moreover, the part features a high efficiency, low noise output modulation scheme that does not require external LC output filters when attached to an inductive load. The modulation provides high efficiency even at low output power. Filterless operation also helps to decrease distortion due to nonlinearities of output LC filters, thereby having a better sound quality and leading to savings in board space and overall cost. This data sheet describes how to configure and use the SSM2301 evaluation board. It is recommended that this data sheet be read in conjunction with the SSM2301 data sheet, which provides more detailed information about the specifications, internal block diagrams, and application guidance for the amplifier IC.
EVALUATION BOARD DESCRIPTION
The SSM2301 evaluation board carries a complete application circuit for driving one loudspeaker. Figure 1 shows the top view of the PCB and Figure 2 shows the typical setup of the evaluation board while in operation. Figure 8 shows its layout. The bottom layer of the evaluation board is shown in Figure 9, and its mirrored version is shown in Figure 10. The schematic is shown in Figure 7. The bill of materials is given in Table 1.
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Figure 1. SSM2301 Evaluation Board
Figure 2. SSM2301 Evaluation Board Typical Setup
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 2008 Analog Devices, Inc. All rights reserved.
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