Evaluation Board for
Filterless Class-D Audio Amplifier
EVAL-SSM2301
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.
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Tel: 781.329.4700
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©2008 Analog Devices, Inc. All rights reserved.
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
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
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
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Figure 2. SSM2301 Evaluation Board Typical Setup
