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| 型号： | SSM2317-MINI-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MINI SSM2317 |
| 标准包装： | 1 |
| 放大器类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 3.89W x 1 @ 3 欧姆 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 板类型： | 完全填充 |
| 已用 IC / 零件： | SSM2317 |
| 已供物品： | 板 |
| 产品目录页面： | 764 (CN2011-ZH PDF) |
| 相关产品： | SSM2317CBZ-REEL-ND - IC AMP AUDIO 3.89W MONO D 9WLCSP SSM2317CBZ-REEL7DKR-ND - IC AMP AUDIO 3.89W MONO D 9WLCSP SSM2317CBZ-REEL7CT-ND - IC AMP AUDIO 3.89W MONO D 9WLCSP SSM2317CBZ-REEL7TR-ND - IC AMP AUDIO 3.89W MONO D 9WLCSP |
Filterless High Efficiency
Mono 3 W Class-D Audio Amplifier
SSM2317
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
2008 Analog Devices, Inc. All rights reserved.
FEATURES
Filterless Class-D amplifier with Σ-Δ modulation
Automatic level control (ALC) improves dynamic range and
prevents clipping
3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply
with <10% total harmonic distortion (ALC off)
700 mW into 8 Ω load at 4.2 V supply (ALC 80%)
93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
>93 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 × 1.5 mm WLCSP
Pop-and-click suppression
Built-in resistors reduce board component count
Default fixed 18 dB or user-adjustable gain setting
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2317 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 <1% THD + N driving a 3 Ω load from a 5.0 V supply.
The SSM2317 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 93% efficiency at 1.4 W into 8 Ω or 85%
efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR of
>93 dB. Spread-spectrum pulse density modulation is used to
provide lower EMI radiated emissions compared with other
Class-D architectures.
Automatic level control (ALC) can be activated to suppress
clipping and improve dynamic range. This feature only requires
one external resistor tied to GND via the VTH pin and an
activation voltage on the ALC_EN pin.
The SSM2317 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, reducing audible noise on activation and deactivation.
The default gain of the SSM2317 is 18 dB, but users can reduce the
gain by using a pair of external resistors (see the Gain section).
The SSM2317 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 9-ball, 1.5 mm × 1.5 mm
wafer level chip scale package (WLCSP).
FUNCTIONAL BLOCK DIAGRAM
SHUTDOWN
FET
DRIVER
MODULATOR
(Σ-Δ)
0.1F
VDD
GND
INTERNAL
OSCILLATOR
POP-AND-CLICK
SUPPRESSION
OUT+
OUT–
IN+
VBATT
2.5V TO 5.5V
IN–
VTH
RTH
10F
0.1F1
80k
10k
1 INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
SD
AUDIO IN–
AUDIO IN+
SSM2317
07
24
2-
0
01
BIAS
ALC
ALC_EN
ALC ENABLE
Figure 1.
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