SSM2304Z-EVAL Analog Devices Inc, SSM2304Z-EVAL Datasheet

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SSM2304Z-EVAL

Manufacturer Part Number
SSM2304Z-EVAL
Description
EVAL BOARD FOR SSM2304Z
Manufacturer
Analog Devices Inc
Datasheet

Specifications of SSM2304Z-EVAL

Amplifier Type
Class D
Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
2.4W x 2 @ 4 Ohm
Voltage - Supply
2.5 V ~ 5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
SSM2304
Other names
Q3279966
FEATURES
Filterless Class-D amplifier with built-in output stage
2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply with <10% THD
85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
Better than 98 dB SNR (signal-to-noise ratio)
Available in 16-lead, 3 mm × 3 mm LFCSP
Single-supply operation from 2.5 V to 5.0 V
20 nA ultralow shutdown current
Short-circuit and thermal protection
Pop-and-click suppression
Built-in resistors reduce board component count
Default fixed 18 dB gain and user-adjustable
APPLICATIONS
Notebooks and PCs
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2304 is a fully integrated, high efficiency, Class-D stereo
audio amplifier. It is designed to maximize performance for
portable applications. The application circuit requires a mini-
mum of external components and operates from a single 2.5 V
to 5.0 V supply. It is capable of delivering 2 W of continuous
output power with less than 10% THD + N driving a 4 Ω load
from a 5.0 V supply.
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.
SHUTDOWN
GAIN = 300kΩ/(47kΩ + Rext)
RIGHT IN+
RIGHT IN–
LEFT IN+
LEFT IN–
1
INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY V
22nF
22nF
22nF
22nF
1
1
1
1
Rext
Rext
Rext
Rext
INR+
INR–
SD
INL+
INL–
FUNCTIONAL BLOCK DIAGRAM
SSM2304
47kΩ
47kΩ
47kΩ
47kΩ
DD
/2.
300kΩ
300kΩ
300kΩ
300kΩ
BIAS
Figure 1.
10µF
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The SSM2304 features a high efficiency, low noise modulation
scheme. It operates with 85% efficiency at 1.4 W into 8 Ω from a
5.0 V supply and has a signal-to-noise ratio (SNR) that is better
than 98 dB. PDM modulation is used to provide lower EMI-
radiated emissions compared with other Class-D architectures.
The SSM2304 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 architecture of the device allows it to achieve a very low level
of pop and click. 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 SSM2304 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 SSM2304 also has excellent rejection of power supply noise,
including noise caused by GSM transmission bursts and RF
rectification.
The SSM2304 has a preset gain of 18 dB, which can be reduced
by using external resistors.
The SSM2304 is specified over the commercial temperature range
(−40°C to +85°C). It has built-in thermal shutdown and output
short-circuit protection. It is available in a 16-lead, 3 mm × 3 mm
lead-frame chip scale package (LFCSP).
MODULATOR
OSCILLATOR
MODULATOR
INTERNAL
0.1µF
GND
VDD
GND
VDD
Stereo Audio Amplifier
2 W Filterless Class-D
DRIVER
DRIVER
DD
FET
FET
VBATT
2.5V TO 5.0V
/2.
©2006 Analog Devices, Inc. All rights reserved.
OUTR+
OUTR–
OUTL+
OUTL–
SSM2304
www.analog.com

Related parts for SSM2304Z-EVAL

SSM2304Z-EVAL Summary of contents

Page 1

FEATURES Filterless Class-D amplifier with built-in output stage 2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply with <10% THD 85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker Better than 98 ...

Page 2

SSM2304 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............................. ...

Page 3

SPECIFICATIONS 5 Ω, 8 Ω; gain = 18 dB; unless otherwise noted Table 1. Parameter DEVICE CHARACTERISTICS Output Power Efficiency Total Harmonic Distortion + Noise Input ...

Page 4

SSM2304 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings apply at 25°C, unless otherwise noted. Table 2. Parameter Supply Voltage Input Voltage Common-Mode Input Voltage ESD Susceptibility Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic 1 OUTL+ 2 OUTL− INL+ 5 INL− INR− 9 INR OUTR− 12 OUTR+ 13 GND 14 ...

Page 6

SSM2304 TYPICAL PERFORMANCE CHARACTERISTICS 100 R = 4Ω, 33µH L GAIN = 18dB 0.1 0.01 0.001 0.00001 0.0001 0.001 0.01 OUTPUT POWER (W) Figure 3. THD + N vs. Output Power into 4 Ω, A ...

Page 7

8Ω, 33µH L GAIN = 6dB 10 0.25W 1 0.125W 0.1 0.01 0.075W 0.001 0.0001 20 100 1k FREQUENCY (Hz) Figure 9. THD + N vs. Frequency 2 ...

Page 8

SSM2304 100 8Ω, 33µH L GAIN = 18dB 10 0.25W 1 0.1 0.01 0.075W 0.001 0.0001 20 100 1k FREQUENCY (Hz) Figure 15. THD + N vs. Frequency 2 ...

Page 9

GAIN = 6dB 1 8Ω, 15µH L 1.4 10% 1.2 1% 1.0 0.8 0.6 0.4 0.2 0 3.6 3.8 4.0 4.2 4.4 SUPPLY VOLTAGE (V) Figure 21. Maximum Output Power vs. Supply Voltage, R ...

Page 10

SSM2304 1 3. 8Ω, 33µH 0.9 L 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 0.1 0.2 0.3 0.4 0.5 OUTPUT POWER (W) Figure 27. Power Dissipation vs. Output Power at V 1.8 ...

Page 11

R = 8Ω, 33µH L GAIN = 6dB –10 –20 –30 –40 –50 –60 –70 –80 10 100 1k 10k FREQUENCY (Hz) Figure 33. Common-Mode Rejection Ratio vs. Frequency 3. rms RIPPLE ...

Page 12

SSM2304 TYPICAL APPLICATION CIRCUITS 22nF RIGHT IN+ RIGHT IN– 22nF SHUTDOWN 22nF LEFT IN+ LEFT IN– 22nF 1 INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE VOLTAGE IS APPROXIMATELY V 22nF RIGHT IN 22nF SHUTDOWN 22nF LEFT IN 22nF 0.1µF ...

Page 13

APPLICATION NOTES OVERVIEW The SSM2304 stereo Class-D audio amplifier features a filterless modulation scheme that greatly reduces the external components count, conserving board space and thus reducing systems cost. The SSM2304 does not require an output filter, but instead relies ...

Page 14

SSM2304 LAYOUT As output power continues to increase, care needs to be taken to lay out PCB traces and wires properly between the amplifier, load, and power supply. A good practice is to use short, wide PCB tracks to decrease ...

Page 15

EVALUATION BOARD INFORMATION INTRODUCTION This section describes how to configure and use the SSM2304 Evaluation Board Revision 3.0. There are several ways to connect the audio signal to the amplifier on the evaluation board. For example, the signal can be ...

Page 16

SSM2304 Figure 44. Bottom Layers Figure 45. Mirrored Bottom Layers On the upper left corner of the schematic shown in Figure 46, there is an audio stereo jack connector (3.5 mm), J1. This jack is compatible with standard stereo audio ...

Page 17

OUTL+ 1 OUTL INL Figure 46. ...

Page 18

SSM2304 GETTING STARTED To ensure proper operation, follow these steps: 1. Verify that the control switches are at the proper positions. 2. Put S1H, the shutdown control, in the lower position to turn on the amplifier. 3. Put S1G, the ...

Page 19

PCB LAYOUT GUIDELINES To keep the EMI within the allowable limits and ensure that the amplifier chip operates within the temperature limits, adhere to the following guidelines. 1. Place nine vias onto the thermal pad of the amplifier. The outer ...

Page 20

... PLANE ORDERING GUIDE Model Temperature Range 1 SSM2304CPZ-REEL −40°C to +85°C 1 SSM2304CPZ-REEL7 −40°C to +85°C SSM2304Z-EVAL Pb-free part. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06162-0-12/06(0) 3.00 0.60 MAX BSC SQ ...

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