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PDF SSM2305 Data sheet ( Hoja de datos )
| Número de pieza | SSM2305 | |
| Descripción | Filterless High Efficiency Mono 2.8 W Class-D Audio Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SSM2305 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Filterless High Efficiency
Mono 2.8 W Class-D Audio Amplifier
SSM2305
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 distortion (THD)
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 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 VDD/2.
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 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.
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).
FUNCTIONAL BLOCK DIAGRAM
10µF
0.1µF
VBATT
2.5V TO 5.5V
AUDIO IN+
AUDIO IN–
SHUTDOWN
47nF*
47nF*
SSM2305
IN+ 37kΩ
IN– 37kΩ
296kΩ
MODULATOR
(Σ-Δ)
VDD
FET
DRIVER
OUT+
OUT–
296kΩ
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
*INPUT CAPACITORS 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.
Free Datasheet http://www.Datasheet4U.com
1 page  
SSM2305
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
SD 1
NC 2
IN+ 3
IN– 4
PIN 1
INDICATOR
SSM2305
TOP VIEW
(Not to Scale)
8 OUT–
7 GND
6 VDD
5 OUT+
NOTES:
1. NC = NO CONNECT.
2. EXPOSED PAD IS NOT CONNECTED INTERNALLY.
FOR INCREASED RELIABILITY OF THE SOLDER
JOINTS AND MAXIMUM THERMAL CAPABILITY IT
IS RECOMMENDED THAT THE PAD BE SOLDERED
TO THE GROUND PLANE.
Figure 2. LFSCP Pin Configuration
SD 1
NC 2
IN+ 3
IN– 4
SSM2305
TOP VIEW
(Not to Scale)
8 OUT–
7 GND
6 VDD
5 OUT+
NC = NO CONNECT
Figure 3. MSOP Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
1 SD
2 NC
3 IN+
4 IN−
5 OUT+
6 VDD
7 GND
8 OUT−
Description
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. A | Page 5 of 16
Free Datasheet http://www.Datasheet4U.com
5 Page 
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 instead on the inherent inductance of the speaker coil
and the natural filtering of the speaker and human ear to fully
recover the audio component of the square wave output. 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
SSM2305
important benefits. Σ-Δ modulators do not produce a sharp peak
with many harmonics in the AM frequency band, as pulse-width
modulators often do. Σ-Δ modulation provides the benefits of
reducing the amplitude of spectral components at high frequencies,
that is, reducing EMI emission that might otherwise be radiated
by speakers and long cable traces. Due to the inherent spread-
spectrum nature of Σ-Δ modulation, the need for oscillator
synchronization is eliminated for designs incorporating multiple
SSM2305 amplifiers.
The SSM2305 also offers protection circuits for overcurrent and
temperature protection.
EXTERNAL GAIN SETTINGS = 296kΩ/(37kΩ + REXT)
10µF
0.1µF
VBATT
2.5V TO 5.5V
AUDIO IN+
AUDIO IN–
47nF* REXT
REXT
47nF*
SSM2305
IN+ 37kΩ
IN– 37kΩ
296kΩ
MODULATOR
(Σ-Δ)
VDD
FET
DRIVER
296kΩ
OUT+
OUT–
SHUTDOWN
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
Figure 32. Differential Input Configuration, User-Adjustable Gain
EXTERNAL GAIN SETTINGS = 296kΩ/(37kΩ + REXT)
10µF
0.1µF
VBATT
2.5V TO 5.5V
AUDIO IN+
47nF REXT
REXT
47nF
SSM2305
IN+ 37kΩ
IN– 37kΩ
296kΩ
MODULATOR
(Σ-Δ)
VDD
FET
DRIVER
296kΩ
OUT+
OUT–
SHUTDOWN
SD
BIAS
INTERNAL
POP/CLICK
OSCILLATOR SUPPRESSION
GND
Figure 33. Single-Ended Input Configuration, User-Adjustable Gain
Rev. A | Page 11 of 16
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SSM2305.PDF ] | |
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