Filterless High Efficiency
Mono 3 W Class-D Audio Amplifier
SSM2311
FEATURES
Filterless Class-D amplifier with 危-螖 modulation
No sync necessary when using multiple Analog Devices, Inc.,
Class-D amplifiers
3 W into 3 惟 load and 1.4 W into 8 惟 load at 5.0 V supply with
less than 10% total harmonic distortion (THD)
90% efficiency at 5.0 V, 1.4 W into 8 惟 speaker
Better than 98 dB signal-to-noise ratio (SNR)
Single-supply operation from 2.5 V to 5.5 V
20 nA ultralow shutdown current
Short-circuit and thermal protection
Available in 9-ball, 1.5 mm 脳 1.5 mm WLCSP
Pop-and-click suppression
Built-in resistors reduce board component count
Default fixed 18 dB or user-adjustable gain setting
The SSM2311 features a high efficiency, low noise modulation
scheme that does not require any external LC output filters. The
modulation continues to provide high efficiency even at low output
power. It operates with 90% efficiency at 1.4 W into 8 惟 or 85%
efficiency at 3 W into 3 惟 from a 5.0 V supply and has an SNR that
is better than 98 dB. Spread-spectrum pulse density modulation
is used to provide lower EMI-radiated emissions compared with
other Class-D architectures.
The SSM2311 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 device also includes pop-and-click suppression circuitry. 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 SSM2311 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 default gain of SSM2311 is 18 dB, but users can reduce the gain
by using a pair of external resistors (see the Gain section).
The SSM2311 is specified over the industrial 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 9-ball, 1.5 mm 脳 1.5 mm
wafer level chip scale package (WLCSP).
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2311 is a fully integrated, high efficiency, 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 3 W of continuous output power
with less than 1% THD + N driving a 3 惟 load from a 5.0 V supply.
FUNCTIONAL BLOCK DIAGRAM
10碌F
0.1碌F
VBATT
2.5V TO 5.0V
VDD
OUT+
MODULATOR
37.5k鈩?/div>
300k鈩?/div>
SHUTDOWN
300k鈩?/div>
(37.5k鈩?+ R
EXT
)
1
INPUT
SSM2311
AUDIO IN+
AUDIO IN鈥?/div>
22nF
1
R
EXT
IN+
IN鈥?/div>
22nF
1
R
EXT
37.5k鈩?/div>
300k鈩?/div>
FET
DRIVER
OUT鈥?/div>
SD
BIAS
OSCILLATOR
GND
POP-AND-CLICK
SUPPRESSION
GAIN =
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2008 Analog Devices, Inc. All rights reserved.
06161-001
SSM2311-MINI-EVALZ 產(chǎn)品屬性
SSM2311-MINI-EVALZ相關(guān)型號(hào)PDF文件下載
-
型號(hào)
版本
描述
廠(chǎng)商
下載
-
英文版
HUSH Stereo Noise Reduction System with Adaptive Threshold
AD
-
英文版
HUSH Stereo Noise Reduction System with Adaptive Threshold
AD [Analog...
-
英文版
Decoder 5.1-Channel Soundfield Generator
AD
-
英文版
Decoder 5.1-Channel Soundfield Generator
AD [Analog...
-
英文版
VOLTAGE CONTROLLED AMPLIFIER
ETC
-
英文版
VOLTAGE CONTROLLED AMPLIFIER
ETC [ETC]
-
英文版
OPERATIONAL VOLTAGE CONTROLLED ELEMENT
ETC
-
英文版
OPERATIONAL VOLTAGE CONTROLLED ELEMENT
ETC [ETC]
-
英文版
Self-Contained Audio Preamplifier
AD
-
英文版
Self-Contained Audio Preamplifier
AD [Analog...
-
英文版
Trimless Voltage Controlled Amplifiers
AD
-
英文版
Trimless Voltage Controlled Amplifiers
AD [Analog...
-
英文版
Self-Contained Audio Preamplifier
AD
-
英文版
Self-Contained Audio Preamplifier
AD [Analog...
-
英文版
DUAL LINEAR ANTILOG VOLTAGE CONTROLLED AMPLIFIER
ETC
-
英文版
DUAL LINEAR ANTILOG VOLTAGE CONTROLLED AMPLIFIER
ETC [ETC]
-
英文版
DUAL LINEAR ANTILOG VOLTAGE CONTROLLED AMPLIFIER
ETC
-
英文版
DUAL LINEAR ANTILOG VOLTAGE CONTROLLED AMPLIFIER
ETC [ETC]
-
英文版
QUAD CURRENT CONTROLLED AMPLIFIER
ETC
-
英文版
QUAD CURRENT CONTROLLED AMPLIFIER
ETC [ETC]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
