2 W, Filterless, Class-D
Stereo Audio Amplifier
SSM2306
FEATURES
Filterless Class-D amplifier with built-in output stage
2 W into 4 惟 and 1.4 W into 8 惟 at 5.0 V supply
Ultralow idle current with load resistance
>87% efficiency at 5.0 V, 1.4 W into 8 惟 speaker
Better than 96 dB SNR (signal-to-noise ratio)
Available in 16-lead, 3 mm 脳 3 mm LFCSP
Single-supply operation from 2.5 V to 5.0 V
20 nA ultralow shutdown current
Short-circuit and thermal protection
Pop-and-click suppression
Built-in resistors reduce board component count
Default fixed 18 dB gain and user-adjustable
The SSM2306 features ultralow idle current, high efficiency, and
a low noise modulation scheme. It operates with >87% efficiency
at 1.4 W into 8 惟 from a 5.0 V supply and has a signal-to-noise
ratio (SNR) that is better than 96 dB. PDM modulation offers lower
EMI radiated emissions compared to other Class-D architectures.
The SSM2306 has a micropower shutdown mode with a typical
shutdown current of 20 nA. Shutdown is enabled by applying a
logic low to the SD pin.
The architecture of the device allows it to achieve a very low level
of pop and click to minimize voltage glitches at the output
during turn-on and turn-off, thereby reducing audible noise on
activation and deactivation. The fully differential input of the
SSM2306 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 V
DD
/2.
The SSM2306 also has excellent rejection of power supply noise,
including noise caused by GSM transmission bursts and RF
rectification.
The SSM2306 has a preset gain of 18 dB that can be reduced by
using external resistors.
The SSM2306 is specified over the commercial temperature range
(鈭?0擄C to +85擄C). It has built-in thermal shutdown and output
short-circuit protection. It is available in a 16-lead, 3 mm 脳 3 mm
lead frame chip scale package (LFCSP).
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
Notebook computers
GENERAL DESCRIPTION
The SSM2306 is a fully integrated, high efficiency, Class-D stereo
audio amplifier designed to maximize performance for portable
applications. The application circuit requires minimum external
components and operates from a single 2.5 V to 5.0 V supply. It
is capable of delivering 2 W of continuous output power with less
than 10% THD + N driving a 4 惟 load from a 5.0 V supply.
FUNCTIONAL BLOCK DIAGRAM
10碌F
0.1碌F
22nF
1
RIGHT IN+
RIGHT IN鈥?/div>
22nF
1
VBATT
2.5V TO 5.0V
VDD
OUTR+
MODULATOR
43k鈩?/div>
344k鈩?/div>
SHUTDOWN
SD
22nF
1
LEFT IN+
LEFT IN鈥?/div>
22nF
1
R
EXT
INL+
R
EXT
INL鈥?/div>
43k鈩?/div>
344k鈩?/div>
GND
GND
43k鈩?/div>
MODULATOR
FET
DRIVER
BIAS
344k鈩?/div>
OUTL+
OUTL鈥?/div>
INTERNAL
OSCILLATOR
FET
DRIVER
OUTR鈥?/div>
SSM2306
R
EXT
INR+
R
EXT
INR鈥?/div>
43k鈩?/div>
344k鈩?/div>
VDD
GAIN = 344k鈩?(43k鈩?+ R
EXT
)
1
INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY V
DD
/2.
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 registered trademarks 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
www.analog.com
Fax: 781.461.3113
漏2007 Analog Devices, Inc. All rights reserved.
06542-001
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