Audio Amplifier. SSM2317 Datasheet

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SSM2317 Datasheet
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Part SSM2317
Description Filterless High Efficiency Mono 3 W Class-D Audio Amplifier
Feature SSM2317; Filterless High Efficiency Mono 3 W Class-D Audio Amplifier SSM2317 FEATURES Filterless Class-D amp.
Manufacture Analog Devices
Datasheet
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Analog Devices SSM2317
Filterless High Efficiency
Mono 3 W Class-D Audio Amplifier
SSM2317
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
0.1µF1
AUDIO IN+
IN+
10k
80k
0.1µF1
AUDIO IN–
IN–
10k
80k
10µF
SSM2317
0.1µF
VDD
VBATT
2.5V TO 5.5V
MODULATOR
(Σ-Δ)
FET
DRIVER
OUT+
OUT–
SHUTDOWN
SD BIAS
ALC
INTERNAL
OSCILLATOR
POP-AND-CLICK
SUPPRESSION
ALC_EN
VTH
GND
ALC ENABLE
RTH
1 INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
Figure 1.
Rev. A
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.
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.



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SSM2317* PRODUCT PAGE QUICK LINKS
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COMPARABLE PARTS
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EVALUATION KITS
SSM2317 Evaluation Board
DOCUMENTATION
Data Sheet
SSM2317: Filterless High Efficiency Mono 3 W Class-D
Audio Amplifier Data Sheet
User Guides
UG-192: Evaluation Board for SSM2317 Filterless Class-D
Audio Amplifier
DESIGN RESOURCES
ssm2317 Material Declaration
PCN-PDN Information
Quality And Reliability
Symbols and Footprints
DISCUSSIONS
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Analog Devices SSM2317
SSM2317
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Typical Application Circuits.......................................................... 13
Theory of Operation ...................................................................... 14
Overview...................................................................................... 14
REVISION HISTORY
6/08—Rev. 0 to Rev. A
Changes to Figure 1.......................................................................... 1
Changes to Table 2............................................................................ 5
Changes to Figure 17 and Figure 18............................................... 9
Changes to Figure 39 and Figure 40............................................. 13
Changes to Ordering Guide .......................................................... 17
3/08—Revision 0: Initial Version
Gain.............................................................................................. 14
Pop-and-Click Suppression ...................................................... 14
Output Modulation Description .............................................. 14
Layout .......................................................................................... 14
Input Capacitor Selection.......................................................... 15
Proper Power Supply Decoupling ............................................ 15
Automatic Level Control (ALC)............................................... 15
Operating Modes........................................................................ 15
Attack Time, Hold Time, and Release Time........................... 15
Output Threshold....................................................................... 16
Enable/Disabling ALC ............................................................... 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
Rev. A | Page 2 of 20







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