SSM2305RMZ-R2 Analog Devices Inc, SSM2305RMZ-R2 Datasheet

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SSM2305RMZ-R2

Manufacturer Part Number
SSM2305RMZ-R2
Description
Mono 2W Class D Audio Amp
Manufacturer
Analog Devices Inc
Type
Class Dr
Datasheet

Specifications of SSM2305RMZ-R2

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
2.8W x 1 @ 4 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Features
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Operational Class
Class-D
Audio Amplifier Output Configuration
1-Channel Mono
Output Power (typ)
2.8x1@4OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.02@8Ohm@1W%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Rail/rail I/o Type
No
Power Supply Rejection Ratio
85dB
Single Supply Voltage (min)
2.5V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
MSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Filterless Class-D amplifier with Σ-Δ modulation
No sync necessary when using multiple Class-D amplifiers
2.8 W into 4 Ω load and 1.6 W into 8 Ω load at 5.0 V supply
89% efficiency at 5.0 V, 1.3 W into 8 Ω speaker
>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 8-lead, 3 mm × 3 mm LFCSP and MSOP
Pop-and-click suppression
Built-in resistors reduce board component count
Fixed and user-adjustable gain configurations
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2305 is a fully integrated, high efficiency, Class-D
audio amplifier 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 2.2 W of continuous output
power with less than 1% THD + N driving a 4 Ω load from a
5.0 V supply. It has built-in thermal shutdown and output short-
circuit protection.
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.
Trademarks and registered trademarks are the property of their respective owners.
from Analog Devices, Inc.
with <10% total harmonic distortion (THD)
*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE VOLTAGE IS
SHUTDOWN
APPROXIMATELY V
AUDIO IN+
AUDIO IN–
47nF*
47nF*
FUNCTIONAL BLOCK DIAGRAM
DD
/2.
IN+
IN–
SD
SSM2305
37kΩ
37kΩ
Mono 2.8 W Class-D Audio Amplifier
BIAS
MODULATOR
Figure 1.
10µF
296kΩ
296kΩ
(Σ-Δ)
OSCILLATOR
INTERNAL
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The SSM2305 features a high efficiency, low noise modulation
scheme that does not require external LC output filters. The modu-
lation provides high efficiency even at low output power. The
SSM2305 operates with 90% efficiency at 1.3 W into 8 Ω or 83%
efficiency at 2.2 W into 4 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.
The SSM2305 has a micropower shutdown mode with a maximum
shutdown current of 30 nA. Shutdown is enabled by applying
a Logic 0 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 SSM2305 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
The SSM2305 has excellent rejection of power supply noise,
including noise caused by GSM transmission bursts and RF
rectification. PSRR is typically 60 dB at 217 Hz.
The default gain of the SSM2305 is 18 dB, but users can reduce the
gain by using a pair of external resistors.
The SSM2305 is specified over the commercial temperature range
(−40°C to +85°C). It is available in both an 8-lead, 3 mm ×
3 mm lead frame chip scale package (LFCSP) and an 8-lead
mini small outline package (MSOP).
0.1µF
DRIVER
FET
GND
SUPPRESSION
Filterless High Efficiency
VDD
POP/CLICK
DD
VBATT
2.5V TO 5.5V
OUT+
OUT–
/2.
©2008 Analog Devices, Inc. All rights reserved.
SSM2305
www.analog.com

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SSM2305RMZ-R2 Summary of contents

Page 1

FEATURES Filterless Class-D amplifier with Σ-Δ modulation No sync necessary when using multiple Class-D amplifiers from Analog Devices, Inc. 2.8 W into 4 Ω load and 1.6 W into 8 Ω load at 5.0 V supply with <10% total harmonic ...

Page 2

SSM2305 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 ...

Page 3

SPECIFICATIONS 5 Ω μH, unless otherwise noted Table 1. Parameter DEVICE CHARACTERISTICS Output Power Efficiency Total Harmonic Distortion + Noise Input Common-Mode Voltage Range ...

Page 4

SSM2305 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings apply wise noted. Table 2. Parameter Supply Voltage Input Voltage Common-Mode Input Voltage Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Stresses above those ...

Page 5

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS PIN INDICATOR NC 2 SSM2305 IN+ 3 TOP VIEW (Not to Scale) IN– 4 NOTES CONNECT. 2. EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE ...

Page 6

SSM2305 TYPICAL PERFORMANCE CHARACTERISTICS 100 R = 4Ω + 33µH L GAIN = 18dB 0.1 0.01 0.0001 0.001 0.01 0.1 OUTPUT POWER (W) Figure 4. THD + N vs. Output ...

Page 7

V = 3.6V DD GAIN = 18dB R = 4Ω + 33µ 0.1 0.5W 0.01 0.25W 0.001 10 100 1000 FREQUENCY (Hz) Figure 10. THD + N vs. Frequency 3 ...

Page 8

SSM2305 3 1kHz GAIN = 18dB 2 4Ω + 33µH L 2.0 10% 1.5 1% 1.0 0.5 0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) Figure 16. Maximum Output Power vs. Supply Voltage ...

Page 9

V = 5. 4Ω + 33µH L 0.4 0.3 0.2 0 0.5 1.0 1.5 2.0 OUTPUT POWER (W) Figure 22. Power Dissipation vs. Output Power into 4 Ω μ ...

Page 10

SSM2305 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 10 100 1000 FREQUENCY (Hz) Figure 28. Power Supply Rejection Ratio vs. Frequency 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 10 100 1000 FREQUENCY ...

Page 11

APPLICATIONS INFORMATION OVERVIEW The SSM2305 mono Class-D audio amplifier features a filterless modulation scheme that greatly reduces the external components count that, in turn, conserves board space, thereby reducing systems cost. The SSM2305 does not require an output filter, relying ...

Page 12

SSM2305 GAIN The SSM2305 has a default gain that can be reduced by using a pair of external resistors with a value calculated as follows: External Gain Settings = 296 kΩ/(37 kΩ POP-AND-CLICK SUPPRESSION Voltage ...

Page 13

PROPER POWER SUPPLY DECOUPLING To ensure high efficiency, low total harmonic distortion (THD), and high PSRR, proper power supply decoupling is necessary. Noise transients on the power supply lines are short duration voltage spikes. Although the actual switching frequency can ...

Page 14

... ORDERING GUIDE Model Temperature Range SSM2305CPZ-R2 1 −40°C to +85°C 1 SSM2305CPZ-REEL −40°C to +85°C 1 SSM2305CPZ-REEL7 −40°C to +85°C 1 SSM2305RMZ-R2 −40°C to +85°C 1 SSM2305RMZ-REEL −40°C to +85°C 1 SSM2305RMZ-REEL7 −40°C to +85°C 1 SSM2305-EVALZ RoHS Compliant Part. 3.25 0.60 MAX 3 ...

Page 15

NOTES Rev Page SSM2305 ...

Page 16

SSM2305 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07243-0-7/08(A) Rev Page ...

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