2 × 2W Filterless Class-D
Stereo Audio Amplifier
SSM2356
The SSM2356 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.
It operates with 92% efficiency at 1.4 W into 8 Ω or 85% efficiency
at 2.0 W into 4 Ω from a 5.0 V supply and has an SNR of >103 dB.
FEATURES
Filterless stereo Class-D amplifier with Σ-Δ modulation
No sync necessary when using multiple Class-D amplifiers
from Analog Devices, Inc.
2 × 2W into 4 Ω load and 2x1.4 W into 8 Ω load at 5.0 V
supply with <1% total harmonic distortion (THD + N)
92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
>103 dB signal-to-noise ratio (SNR)
Single-supply operation from 2.5 V to 5.5 V
20 nA shutdown current; left/right channel control
Short-circuit and thermal protection
Spread-spectrum pulse density modulation is used to provide
lower EMI-radiated emissions compared with other Class-D
architectures. The SSM2356 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.
Available in a 16-ball, 1.66 mm × 1.66 mm WLCSP
Pop-and-click suppression
Built-in resistors that reduce board component count
User-selectable 6 dB or 18 dB gain setting
User-selectable ultralow EMI emission mode
The SSM2356 has a micropower shutdown mode with a typical
shutdown current of 20 nA. Shutdown is enabled by applying
a logic low to the
and
pins. The device also
SDNR
SDNL
includes pop-and-click suppression circuitry that minimizes
voltage glitches at the output during turn-on and turn-off,
reducing audible noise on activation and deactivation.
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
The fully differential input of the SSM2356 provides 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 preset gain of SSM2356 can be
selected between 6 dB and 18 dB with no external components
and no change to the input impedance. Gain can be further
reduced to a user-defined setting by inserting series external
resistors at the inputs.
GENERAL DESCRIPTION
The SSM2356 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 × 2W of contin-
uous output power with <1% THD + N driving a 4 Ω load from a
5.0 V supply.
The SSM2356 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 16-ball, 1.66 mm ×
1.66 mm wafer level chip scale package (WLCSP).
FUNCTIONAL BLOCK DIAGRAM
VBATT
2.5V TO 5.5V
10µF
0.1µF
VDD
VDD
SSM2356
1
1
22nF
22nF
80kΩ
OUTR+
RIGHT IN+
RIGHT IN–
GAIN
CONTROL
FET
DRIVER
MODULATOR
INR+
OUTR–
(Σ-Δ)
INR–
80kΩ
EMISSION
CTRL
BIAS
BIAS
SHUTDOWN–R
SHUTDOWN–L
EDGE
INTERNAL
OSCILLATOR
EDGE
SDNR
SDNL
CONTROL
1
1
22nF
22nF
80kΩ
80kΩ
OUTL+
OUTL–
LEFT IN+
LEFT IN–
GAIN
CONTROL
FET
DRIVER
MODULATOR
(Σ-Δ)
INL+
INL–
GAIN
GND
GND
GAIN
INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY V /2.
GAIN = 6dB OR 18dB
1
DD
Figure 1.
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 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
Fax: 781.461.3113
www.analog.com
©2009 Analog Devices, Inc. All rights reserved.
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