SSM2305-EVALZ Analog Devices Inc, SSM2305-EVALZ Datasheet

BOARD EVAL FOR SSM2305 LFCSP

SSM2305-EVALZ

Manufacturer Part Number
SSM2305-EVALZ
Description
BOARD EVAL FOR SSM2305 LFCSP
Manufacturer
Analog Devices Inc
Datasheets

Specifications of SSM2305-EVALZ

Amplifier Type
Class D
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
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
SSM2305
Silicon Manufacturer
Analog Devices
Application Sub Type
Audio Power Amplifier - Class D
Kit Application Type
Amplifier
Silicon Core Number
SSM2305
Kit Contents
Board
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

Related parts for SSM2305-EVALZ

SSM2305-EVALZ Summary of contents

Page 1

... The SSM2305 has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification. PSRR is typically 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 (− ...

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 Configurations and Function Descriptions ........................... 5 Typical Performance Characteristics ............................................. 6 REVISION HISTORY 7/08—Rev Rev. A Changes to Figure 1 .......................................................................... 1 Change to Shutdown Current Parameter, Table 1 ........................ 3 Change to Differential Input Impedance Parameter, Table 1 ...

Page 3

... Rev Page Min Typ 1.34 = 3.6 V 0.68 DD 1.67 = 3.6 V 0.85 DD 2.22 = 3.6 V 1.1 DD 2.8 = 3 0.02 = 3.6 V 0.02 DD 1.0 55 280 2.0 2 0.1 μ 3.2 3.3 2.8 2.9 2.4 2 1.2 0 >100 40 98 SSM2305 Max Unit − kHz mV 5 kΩ μs kΩ μV dB ...

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 listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...

Page 5

... Shutdown Input. Active low digital input. No Connect. This pin has no function; tie it to GND. Noninverting Input. Inverting Input. Noninverting Output. Power Supply. Ground. Inverting Output. Rev Page SSM2305 SD OUT– SSM2305 NC GND 2 7 TOP VIEW IN+ VDD 3 6 (Not to Scale) IN– OUT+ 4 ...

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 Power into 4 Ω μH, A 100 R = 4Ω + 33µH L GAIN = 6dB 2. 3. 0.1 0.01 0.001 0.001 0.0001 0.01 0.1 OUTPUT POWER (W) Figure 5. THD + N vs. Output Power into 4 Ω ...

Page 7

... L 3 8Ω + 33µH L 2.8 NO LOAD 2.6 2.4 2.2 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) Figure 14. Supply Current vs. Supply Voltage 2. 0.1 0.2 0.3 0.4 0.5 0.6 SHUTDOWN VOLTAGE (V) Figure 15. Shutdown Current vs. Shutdown Voltage SSM2305 100000 = 5 3.6V 0.7 0.8 ...

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 Ω μ 3 1kHz GAIN = 6dB 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 17 ...

Page 9

... Figure 26. Supply Current vs. Output Power into 4 Ω μH 450 400 350 300 250 200 150 100 50 0 1.2 1.4 1.6 0 Figure 27. Supply Current vs. Output Power into 8 Ω μH Rev Page SSM2305 8Ω + 33µH L 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 OUTPUT POWER ( ...

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 (Hz) Figure 29. Common-Mode Rejection Ratio vs. Frequency 10000 100000 10000 100000 Rev ...

Page 11

... Most Class-D amplifiers use some variation of pulse-width modulation (PWM), but the SSM2305 uses Σ-Δ modulation to determine the switching pattern of the output devices, resulting in a number of EXTERNAL GAIN SETTINGS = 296kΩ/(37kΩ AUDIO IN+ AUDIO IN– ...

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 transients at the output of audio amplifiers can occur when shutdown activates or deactivates. Voltage transients as low can be heard as audio pops in the speaker ...

Page 13

... ESL, low ESR capacitor, usually of around 4.7 μF. This capacitor bypasses low frequency noises to the ground plane. For high frequency transient noise, use a 0.1 μF capacitor as close as possible to the VDD pin of the device. Placing the decoupling capacitor as close as possible to the SSM2305 helps maintain efficient performance. Rev Page SSM2305 ...

Page 14

... 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 3.00 SQ 2.75 0.60 MAX 5 2.95 EXPOSED 2.75 SQ TOP PAD VIEW 2 ...

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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