2 × 2 W, Filterless, Stereo, Class-D
Audio Amplifier with ALC and I2C
SSM2380
The SSM2380 features a high efficiency, low noise modulation
scheme that requires no external LC output filters. The modulation
continues to provide high efficiency even at low output power.
The SSM2380 operates with 93% efficiency at 1.4 W into 8 Ω
or with 85% efficiency at 2 W into 4 Ω from a 5.0 V supply and
has an SNR of >100 dB.
FEATURES
Filterless, stereo, Class-D amplifier with Σ-Δ modulation
2 W into 4 Ω load and 1.4 W into 8 Ω load at 5.0 V supply
with <1% total harmonic distortion plus noise (THD + N)
Highly configurable I2C interface for gain adjust, automatic
level control (ALC), and ultralow EMI emissions mode
MODE pin can disable I2C interface for more traditional
stereo amplifier configuration
Stereo-to-mono mixer option via I2C control
93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
Signal-to-noise ratio (SNR): >100 dB
Single-supply operation from 2.5 V to 5.5 V
Ultralow shutdown current: 20 nA
Short-circuit and thermal protection
Pop-and-click suppression
Available in 16-ball, 2.0 mm × 2.0 mm WLCSP
Spread-spectrum pulse density modulation is used to provide
lower EMI-radiated emissions compared with other Class-D
architectures. An added benefit of spread-spectrum Σ-Δ modu-
lation is that no synchronization (SYNC) is needed when using
multiple Class-D amplifiers. For applications that require long
speaker cables (>10 cm), the SSM2380 includes a user-selectable
ultralow EMI emissions mode that eliminates the need for EMI
filters at the Class-D outputs.
The SSM2380 has a micropower shutdown mode with a typical
shutdown current of 20 nA. Shutdown is enabled by applying
SD
a logic low to the
pin or through an optional independent
APPLICATIONS
channel soft shutdown via I2C.
Mobile phones
MP3 players
Portable electronics
The device also includes pop-and-click suppression circuitry.
This suppression circuitry minimizes voltage glitches at the
output during turn-on and turn-off, reducing audible noise
on activation and deactivation.
GENERAL DESCRIPTION
The SSM2380 is a fully integrated, high efficiency, stereo, 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 2 W of continuous output power
with <1% THD + N driving a 4 Ω load from a 5.0 V supply.
The SSM2380 features a highly flexible I2C interface with many
useful settings. Using the I2C control interface, the gain of the
SSM2380 can be selected from 1 dB to 24 dB (plus mute) in
47 steps with no external components. Other features accessed
from the I2C interface include independent left/right channel
shutdown, variable ultralow EMI emission control mode, auto-
matic level control (ALC) for high quality speaker protection,
and stereo-to-mono mixing operation.
The fully differential inputs of the SSM2380 provide excellent
rejection of common-mode noise on the input. Input coupling
capacitors can be omitted if the dc input common-mode voltage
is approximately VDD/2.
The SSM2380 is specified over the commercial temperature
range of −40°C to +85°C. It has built-in thermal shutdown
and output short-circuit protection. It is available in a 16-ball,
2 mm × 2 mm wafer level chip scale package (WLCSP).
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2010–2011 Analog Devices, Inc. All rights reserved.
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