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EVAL-SSM2319Z 参数 Datasheet PDF下载

EVAL-SSM2319Z图片预览
型号: EVAL-SSM2319Z
PDF下载: 下载PDF文件 查看货源
内容描述: 无滤波器,高效率,单声道3瓦D类音频放大器 [Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier]
分类和应用: 音频放大器
文件页数/大小: 20 页 / 492 K
品牌: AD [ ANALOG DEVICES ]
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Filterless, High Efficiency,
Mono 3 W Class-D Audio Amplifier
SSM2319
FEATURES
Filterless Class-D amplifier with ultraefficient spread-
spectrum Σ-Δ modulation
Internal modulator synchronization (SYNC)
3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply
with <1% total harmonic distortion (THD)
90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
Signal-to-noise ratio (SNR): 98 dB
Single-supply operation: 2.5 V to 5.5 V
Ultralow shutdown current: 20 nA
Short-circuit and thermal protection with autorecovery
Available in 9-ball, 1.5 mm × 1.5 mm WLCSP
Pop-and-click suppression
Built-in resistors reduce board component count
Default fixed 12 dB or user-adjustable gain setting
The SSM2319 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 Ω or 85%
efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR
of 98 dB. Spread-spectrum pulse density modulation is used to
provide lower EMI-radiated emissions compared with other
Class-D architectures.
SYNC can be activated in the event that end users are concerned
about clock intermodulation (beating effect) of several amplifiers in
close proximity.
The SSM2319 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 SSM2319 is 12 dB, but users can reduce
the gain by using a pair of external resistors (see the Gain section).
The SSM2319 is specified over the industrial 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).
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2319 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.
FUNCTIONAL BLOCK DIAGRAM
10µF
0.1µF
VBATT
2.5V TO 5.5V
VDD
OUT+
MODULATOR
(Σ-Δ)
160kΩ
SHUTDOWN
SD
BIAS
INTERNAL
OSCILLATOR
FET
DRIVER
OUT–
SSM2319
0.1µF*
AUDIO IN–
AUDIO IN+
0.1µF*
IN–
IN+
40kΩ
40kΩ
160kΩ
POP/CLICK
SUPPRESSION
SYNC
SYNCO
SYNC OUTPUT
GND SYNCI
SYNC INPUT
*INPUT CAPACITORS 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
©2008 Analog Devices, Inc. All rights reserved.
07550-001