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SSM2305CPZ-R2 Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte SSM2305CPZ-R2
Spiegazioni elettronici  Filterless High Efficiency Mono 2.8 W Class-D Audio Amplifier
PDF  16 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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SSM2305CPZ-R2 Scheda tecnica(HTML) 11 Page - Analog Devices

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SSM2305
Rev. 0 | Page 11 of 1
6
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
recover fully 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 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 oscil-
lator synchronization is eliminated for designs incorporating
multiple SSM2305 amplifiers.
The SSM2305 also offers protection circuits for overcurrent and
temperature protection.
SHUTDOWN
0.1µF
VDD
POP/CLICK
SUPPRESSION
OUT+
OUT–
IN+
VBATT
2.5V TO 5.5V
IN–
MODULATOR
(Σ-Δ)
GND
10µF
47nF*
47nF*
*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
EXTERNAL GAIN SETTINGS = 160kΩ/(20kΩ + REXT)
SD
AUDIO IN–
AUDIO IN+
SSM2305
20kΩ
160kΩ
160kΩ
20kΩ
REXT
REXT
FET
DRIVER
BIAS
INTERNAL
OSCILLATOR
Figure 32. Differential Input Configuration, User-Adjustable Gain
SHUTDOWN
0.1µF
VDD
POP/CLICK
SUPPRESSION
OUT+
OUT–
MODULATOR
(Σ-Δ)
GND
10µF
SD
SSM2305
20kΩ
160kΩ
160kΩ
20kΩ
REXT
REXT
FET
DRIVER
BIAS
INTERNAL
OSCILLATOR
EXTERNAL GAIN SETTINGS = 160kΩ/(20kΩ + REXT)
IN+
IN–
AUDIO IN+
VBATT
2.5V TO 5.5V
47nF
47nF
Figure 33. Single-Ended Input Configuration, User-Adjustable Gain



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