EVAL-SSM4567Z User Guide
UG-704
One
Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the
SSM4567
Digital 2.5 W, 5.1 V, Boost Class-D Audio Amplifier
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 23
FEATURES
I
2
S/PDM/TDM/optical digital audio input
Full featured evaluation board for the
SSM4567
PCB footprint for optional EMI filter
Includes the
EVAL-ADUSB2EBZ
USB hardware interface
for plug-and-play operation
Microsoft Windows-based evaluation software with
simple graphical user interface
EQUIPMENT REQUIRED
Audio source with optical fiber or 10-pin 0.100" digital
audio header
Power supply (5.0 V, 2.0 A recommended)
EVAL-SSM4567Z
evaluation board
USB-to-I
2
C adapter dongle,
EVAL-ADUSB2EBZ
PC running Windows XP or later; USB 2.0 port required
Speaker or other load
DOCUMENTS REQUIRED
SSM4567
data sheet
OPTIONAL SOFTWARE
SigmaStudio software
GENERAL DESCRIPTION
The
SSM4567
evaluation board is a complete solution for
driving loudspeakers with boosted battery power supply as well
as sense output current, output voltage, and the VBAT supply
voltage. It includes the
SSM4567
amplifier IC and the additional
components needed to connect the digital audio input and
optical fiber.
The
SSM4567
combines an audio digital-to-analog converter
(DAC), a power amplifier, and PDM or PCM (I
2
S/TDM) digital
audio interfaces on a single chip. Using the
SSM4567
, audio can
be transmitted digitally to the audio amplifier, significantly
reducing the effect of noise sources on the transmitted audio
and eliminating the need for input coupling capacitors. The
SSM4567
is capable of delivering 2.5 W of continuous output
power with <1% THD + N driving a 4 Ω load from a 3.6 V
supply.
The
SSM4567
can be controlled by I
2
C, PDM pattern control, or
TDM control. It can also operate in standalone mode without a
control interface.
The
SSM4567
includes circuitry to sense output current, output
voltage, and the VBAT supply voltage. Current sense is
performed using an on-chip sense resistor that is connected
between an output pin and the load. Output current and voltage
are sent to ADCs. The output of these ADCs are available on
the digital serial output port. The VBAT supply voltage can
be used with an automatic gain control circuit that is fully
configurable. This AGC can limit the maximum output at low
battery voltages to avoid current that is too high off the battery.
This user guide describes how to use the
EVAL-SSM4567Z
to test the features of the
SSM4567
amplifier. It describes
the hardware and software of the
SSM4567
evaluation board,
including detailed schematics and PCB layout artwork.
The
SSM4567
data sheet provides detailed information about the
specifications, internal block diagrams, and application
guidance for the amplifier IC.
