Analog Devices EVAL-SSM2311 Manual

FEATURES

Single-ended and differential input capability
Multiple input interface connection options (jack or header)
Optimized EMI suppression filter assembled on board
PCB footprint for dc power supply jack (accepts 2.5 V to 5.5 V)

GENERAL DESCRIPTION

The SSM2311 is a fully integrated, single-chip, mono Class-D
audio amplifier. It is designed to maximize performance for
mobile phone applications. The application circuit requires a
minimum of external components and operates from a single
2.5 V to 5.5 V supply. It is capable of delivering 3 W of conti-
nuous output power with less than 1% THD + N driving an
3 Ω load from a single 5.0 V supply.
The SSM2311 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
Figure 1. SSM2311 Evaluation Board Top View
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.
Filterless Class-D Audio Amplifier
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 providing a better sound quality
and leading to savings in board space and overall cost.
This data sheet describes how to configure and use the SSM2311
evaluation board. It is recommended that this data sheet be
read in conjunction with the SSM2311 data sheet, which
provides more detailed information about the specifications,
internal block diagrams, and application guidance for the
amplifier IC.

EVALUATION BOARD DESCRIPTION

The SSM2311 evaluation board carries a complete application
circuit for driving a loudspeaker. Figure 1 shows the top view
of the evaluation board and Figure 2 shows the bottom view.
The top layer with its silkscreen of the evaluation board is shown
in Figure 5. Figure 6 and Figure 7 show the top silkscreen and
bottom silkscreen, respectively. The top layer, Layer 2 (ground
plane), Layer 3 (power plane), and bottom layer are shown in
Figure 8, Figure 9, Figure 10, and Figure 11, respectively.
Figure 2. SSM2311 Evaluation Board Bottom View
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Evaluation Board for
EVAL-SSM2311
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