Filterless High Efficiency
Class-D Stereo Audio Amplifier
SSM2302
FEATURES
Filterless Class-D amplifier with built-in output stage
1.4 W into 8 惟 at 5.0 V supply with less than 1% THD
85% efficiency at 5.0 V, 1.4 W into 8 惟 speaker
Better than 98 dB SNR (signal-to-noise ratio)
Single-supply operation from 2.5 V to 5.0 V
20 nA ultralow shutdown current
Short-circuit and thermal protection
Available in 16-lead, 3 mm 脳 3 mm LFCSP
Pop-and-click suppression
Built-in resistors reduce board component count
Fixed and user-adjustable gain configurations
5.0 V supply and has a signal-to-noise ratio (SNR) that is better
than 98 dB. PDM modulation is used to provide lower EMI-
radiated emissions compared with other Class-D architectures.
The SSM2302 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. This minimizes voltage glitches at the output
during turn-on and turn-off, thus reducing audible noise on
activation and deactivation.
The fully differential input of the SSM2302 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 SSM2302 also has excellent rejection of power supply noise,
including noise caused by GSM transmission bursts and RF
rectification. PSRR is typically 63 dB at 217 Hz.
The gain can be set to 6 dB or 12 dB utilizing the gain control
select pin connected respectively to ground or V
DD
. Gain can
also be adjusted externally by using an external resistor.
The SSM2302 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
GENERAL DESCRIPTION
The SSM2302 is a fully integrated, high efficiency, Class-D stereo
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 5.0 V supply. It is capable of delivering 1.4 W of con-
tinuous output power with less than 1% THD + N driving an
8 惟 load from a 5.0 V supply.
The SSM2302 features a high efficiency, low noise modulation
scheme. It operates with 85% efficiency at 1.4 W into 8 惟 from a
10碌F
FUNCTIONAL BLOCK DIAGRAM
0.1碌F
VBATT
2.5V TO 5.0V
VDD
OUTR+
GAIN
CONTROL
MODULATOR
FET
DRIVER
OUTR鈥?/div>
SSM2302
0.01碌F
1
RIGHT IN+
RIGHT IN鈥?/div>
0.01碌F
1
SHUTDOWN
GAIN
SD
GAIN
BIAS
INR+
INR鈥?/div>
VDD
INTERNAL
OSCILLATOR
0.01碌F
1
LEFT IN+
LEFT IN鈥?/div>
0.01碌F
1
INL+
INL鈥?/div>
GAIN
CONTROL
MODULATOR
GND
FET
DRIVER
GND
OUTL+
OUTL鈥?/div>
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2006 Analog Devices, Inc. All rights reserved.
06051-001
SSM2302CPZ-R2 產(chǎn)品屬性
1
集成電路 (IC)
線性 - 音頻放大器
-
D 類
2 通道（立體聲）
1.4W x 2 @ 8 歐姆
2.5 V ~ 5 V
消除爆音，差分輸入，短路和熱保護，關閉
表面貼裝
16-LFCSP-VQ
16-VFQFN 裸露焊盤，CSP
Digi-Reel®
SSM2302CPZ-R2DKR
SSM2302CPZ-R2相關型號PDF文件下載
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