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PDF SSM2315 Data sheet ( Hoja de datos )
| Número de pieza | SSM2315 | |
| Descripción | Filterless High Efficiency Mono 3W Class-D Audio Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SSM2315 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Filterless, High Efficiency,
Mono 3 W Class-D Audio Amplifier
SSM2315
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
>103 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 6 dB or user adjustable gain setting
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
GENERAL DESCRIPTION
The SSM2315 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 SSM2315 features a high efficiency, low noise modulation
scheme that requires no 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 >103 dB.
Spread-spectrum pulse density modulation is used to provide
lower EMI-radiated emissions compared with other Class-D
architectures.
The SSM2315 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 SSM2315 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 VDD/2.
The default gain of the SSM2315 is 6 dB, but users can reduce the
gain by using a pair of external resistors (see the Gain section).
The SSM2315 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*
SSM2315
IN+ 80kΩ
IN– 80kΩ
160kΩ
MODULATOR
(Σ-Δ)
160kΩ
VDD
FET
DRIVER
OUT+
OUT–
SHUTDOWN
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
*INPUT CAPS 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.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
BALL A1
CORNER
12
3
A
B
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
2C SD
2A GND
1A IN+
1C IN−
3C OUT+
1B VDD
3B GND
3A OUT−
2B PVDD
C
SSM2315
TOP VIEW
BALL SIDE DOWN
(Not to Scale)
Figure 2. Pin Configuration
Description
Shutdown Input. Active low digital input.
Ground.
Noninverting Input.
Inverting Input.
Noninverting Output.
Power Supply.
Ground.
Inverting Output.
Power Supply.
SSM2315
Rev. A | Page 5 of 16
5 Page 
TYPICAL APPLICATION CIRCUITS
EXTERNAL GAIN SETTINGS = 160kΩ/(80kΩ + REXT)
10µF
0.1µF
VBATT
2.5V TO 5.5V
AUDIO IN+
AUDIO IN–
47nF* REXT
REXT
47nF*
SSM2315
IN+ 80kΩ
IN– 80kΩ
160kΩ
MODULATOR
(Σ-Δ)
VDD
FET
DRIVER
160kΩ
OUT+
OUT–
SHUTDOWN
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
*INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
Figure 31. Differential Input Configuration, User-Adjustable Gain
EXTERNAL GAIN SETTINGS = 160kΩ/(80kΩ + REXT)
10µF
0.1µF
VBATT
2.5V TO 5.5V
AUDIO IN+
47nF REXT
REXT
47nF
SSM2315
IN+ 80kΩ
IN– 80kΩ
160kΩ
MODULATOR
(Σ-Δ)
VDD
FET
DRIVER
160kΩ
OUT+
OUT–
SHUTDOWN
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
Figure 32. Single-Ended Input Configuration, User-Adjustable Gain
SSM2315
Rev. A | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SSM2315.PDF ] | |
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