2 ×10 W Filterless Class-D
Stereo Audio Amplifier
SSM3302
Data Sheet
load or with 82% efficiency at 10 W into 4 Ω from a 12 V supply,
and it has an SNR of >98 dB.
FEATURES
Filterless stereo Class-D amplifier with Σ-Δ modulation
2 × 10 W into 4 Ω load and 2 × 8 W into 8 Ω load at 12 V supply
with <1% total harmonic distortion plus noise (THD + N)
91% efficiency at 12 V, 8 W into 8 Ω speaker
98 dB signal-to-noise ratio (SNR)
Single-supply operation from 7 V to 18 V
Flexible gain adjustment pin from 9 dB to 24 dB
Fixed input impedance of 40 kΩ
Mono output mode pin for 1 × 20 W output power into 2 Ω
10 µA shutdown current
Short-circuit and thermal protection
Available in a 40-lead, 6 mm × 6 mm LFCSP
Pop-and-click suppression
Spread spectrum pulse density modulation (PDM) is used to
provide lower EMI radiated emissions compared with other
Class-D architectures. The SSM3302 includes an optional
modulation select pin (ultralow EMI emission mode) that
significantly reduces the radiated emissions at the Class-D
outputs, particularly above 100 MHz. The SSM3302 can pass
FCC Class-B emissions testing with an unshielded 20 inch cable
using common-mode choke-based filtering.
The fully differential input of the SSM3302 provides excellent
rejection of common-mode noise on the input. The device also
includes a highly flexible gain select pin that only requires one
series resistor to choose a gain between 9 dB and 24 dB, with no
change to the input impedance. The benefit of this is to improve
gain matching between multiple SSM3302 devices within a single
application compared with using external resistors to set gain.
User-selectable ultralow EMI emissions mode
Thermal warning indicator
Power-on reset
APPLICATIONS
The SSM3302 includes an integrated voltage regulator that
generates a 5 V rail.
Mobile computing
Flat panel televisions
Media docking stations
Portable electronics
Sound bars
The SSM3302 has a micropower shutdown mode with a typical
shutdown current of 10 µA. Shutdown is enabled by applying a
SD
logic low to the
pin. The device also includes pop-and-click
suppression circuitry that minimizes voltage glitches at the output
during turn on and turn off, reducing audible noise during
activation and deactivation.
GENERAL DESCRIPTION
The SSM3302 is a fully integrated, high efficiency, stereo Class-D
audio amplifier. The application circuit requires minimal external
components and operates from a single 7 V to 18 V supply. The
device is capable of delivering 2 × 10 W of continuous output
power into a 4 Ω load (or 2 × 8 W into 8 Ω) with <1% THD + N
from a 12 V supply. In addition, while mono mode is activated,
the user can drive a load as small as 2 Ω up to 20 W continuous
output power by stacking the stereo output terminals.
Other included features to simplify system level integration of
the SSM3302 are input low-pass filtering to suppress out-of-
band DAC noise interference to the pulse density modulator,
fixed input impedance to simplify component selection across
multiple platform production builds, and a thermal warning
indicator pin.
The SSM3302 is specified over the commercial temperature
range (−40°C to +85°C). It has built-in thermal shutdown and
output short-circuit protection. It is available in a halide-free,
40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP).
The SSM3302 features a high efficiency, low noise modulation
scheme that requires no external LC output filters. This scheme
continues to provide high efficiency even at low output power.
The SSM3302 operates with 90% efficiency at 7 W into an 8 Ω
Rev. 0
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 fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
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
©2012 Analog Devices, Inc. All rights reserved.
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