Audio Amplifier. SSM2335 Datasheet

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SSM2335 Datasheet
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Part SSM2335
Description Mono 3 W Class-D Audio Amplifier
Feature SSM2335; Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier SSM2335 FEATURES Filterless Class-D a.
Manufacture Analog Devices
Datasheet
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Analog Devices SSM2335
Filterless, High Efficiency,
Mono 3 W Class-D Audio Amplifier
SSM2335
FEATURES
Filterless Class-D amplifier with Σ-Δ modulation
No sync necessary when using multiple Class-D amplifiers
from Analog Devices, Inc.
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 + N)
93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
>96 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 SSM2335 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 SSM2335 features a high efficiency, low noise modulation
scheme that requires no external LC output filters. The modu-
lation 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 >96 dB. Spread-spectrum pulse density modulation is used
to provide lower EMI-radiated emissions compared with other
Class-D architectures.
The SSM2335 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 suppression circuitry minimizes voltage glitches at the
output during turn-on and turn-off, reducing audible noise
on activation and deactivation.
The fully differential input of the SSM2335 provides excellent
rejection of common-mode noise on the input. Input coupling
capacitors can be omitted if the input dc common-mode voltage
is approximately VDD/2.
The default gain of the SSM2335 is 18 dB, but users can reduce the
gain by using a pair of external resistors (see the Gain section).
The SSM2335 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).
FUNCTIONAL BLOCK DIAGRAM
10µF
0.1µF
VBATT
2.5V TO 5.5V
47nF*
AUDIO IN+
AUDIO IN–
47nF*
SSM2335
IN+ 20k
IN– 20k
160k
MODULATOR
(Σ-Δ)
160k
VDD
FET
DRIVER
OUT–
OUT+
SHUTDOWN
SD
BIAS
INTERNAL POP-AND-CLICK
OSCILLATOR SUPPRESSION
GND
*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/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.
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.



Analog Devices SSM2335
SSM2335* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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EVALUATION KITS
SSM2335 Evaluation Board
DOCUMENTATION
Data Sheet
SSM2335: Filterless, High Efficiency, Mono 3 W Class-D
Audio Amplifier Data Sheet
DESIGN RESOURCES
ssm2335 Material Declaration
PCN-PDN Information
Quality And Reliability
Symbols and Footprints
DISCUSSIONS
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Analog Devices SSM2335
SSM2335
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 4 
Thermal Resistance ...................................................................... 4 
ESD Caution.................................................................................. 4 
Pin Configuration and Function Descriptions............................. 5 
Typical Performance Characteristics ............................................. 6 
REVISION HISTORY
10/08—Revision 0: Initial Version
Typical Application Circuits ......................................................... 11 
Theory of Operation ...................................................................... 12 
Overview ..................................................................................... 12 
Gain.............................................................................................. 12 
Pop-and-Click Suppression ...................................................... 12 
Output Modulation Description .............................................. 12 
Layout .......................................................................................... 13 
Input Capacitor Selection.......................................................... 13 
Power Supply Decoupling ......................................................... 13 
Outline Dimensions ....................................................................... 14 
Ordering Guide .......................................................................... 14 
Rev. 0 | Page 2 of 16







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