Evaluation Board for
Filterless Class-D Audio Amplifier
EVAL-SSM2317-MINI
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
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result from its use. Analog Devices reserves the right to change devices or specifications at any
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owners. Evaluation boards are not authorized to be used in life support devices or systems.
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Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved
FEATURES
Single-ended and differential input capability
Small size board allows easy integration into custom
space-constrained applications (6.6 mm × 6.6 mm)
GENERAL DESCRIPTION
The SSM2317 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 1.4 W of con-
tinuous output power with less than 1% THD + N, driving an
8 Ω load from a single 5.0 V supply.
The SSM2317 is equipped with a differential mode input port
and a high efficiency, full H-bridge at the output that enables
direct coupling of the audio power signal to the loudspeaker.
The differential mode input stage allows for cancelling of
common-mode noise.
The part also features a high efficiency, low noise output
modulation scheme that does not require external LC output
filters when attached to an inductive load. It operates with
85% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has
a signal-to-noise ratio (SNR) that is better than 93 dB.
Spread-spectrum modulation is used to provide lower EMI-
radiated emissions. The modulation provides high efficiency
even at low output power. Filterless operation also helps to
decrease distortion due to the nonlinearities of output LC filters.
This data sheet describes how to configure and use the SSM2317
mini evaluation board to test the SSM2317. It is recommended
that this data sheet be read in conjunction with the
data sheet, which provides more detailed information about
the specifications, internal block diagrams, and application
guidance for the amplifier IC.
EVALUATION BOARD DESCRIPTION
The SSM2317 mini evaluation board is a small form factor
board (6.6 mm × 6.6 mm) with a pair of differential audio
input terminals (IN+ and IN−), a pair of audio signal output
terminals (OUT+ and OUT−), a ground terminal, and a VDD
terminal. It is designed for easy integration into the SSM2317
application board.
The SSM2317 mini 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.
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Figure 1. SSM2317 Evaluation Board Top View
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Figure 2. SSM2317 Evaluation Board Bottom View
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