参数资料
型号: SSM2305CPZ-REEL7
厂商: Analog Devices Inc
文件页数: 3/16页
文件大小: 0K
描述: IC AMP AUDIO 2.8W MONO D 8LFCSP
标准包装: 1
类型: D 类
输出类型: 1-通道(单声道)
在某负载时最大输出功率 x 通道数量: 2.8W x 1 @ 4 欧姆
电源电压: 2.2 V ~ 5.5 V
特点: 消除爆音,差分输入,短路和热保护,关闭
安装类型: 表面贴装
供应商设备封装: 8-LFCSP-VD(3x3)
封装/外壳: 8-VFDFN 裸露焊盘,CSP
包装: 标准包装
产品目录页面: 764 (CN2011-ZH PDF)
配用: SSM2305-EVALZ-ND - BOARD EVAL FOR SSM2305 LFCSP
其它名称: SSM2305CPZ-REEL7DKR
SSM2305
Rev. A | 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 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
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.
0
72
43
-03
2
SHUTDOWN
0.1F
VDD
POP/CLICK
SUPPRESSION
OUT+
OUT–
IN+
VBATT
2.5V TO 5.5V
IN–
MODULATOR
(Σ-Δ)
GND
10F
47nF*
*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE
VOLTAGE IS APPROXIMATELY VDD/2.
EXTERNAL GAIN SETTINGS = 296k/(37k + REXT)
SD
AUDIO IN–
AUDIO IN+
SSM2305
37k
296k
37k
REXT
FET
DRIVER
BIAS
INTERNAL
OSCILLATOR
Figure 32. Differential Input Configuration, User-Adjustable Gain
07
24
3-
0
33
SHUTDOWN
0.1F
VDD
POP/CLICK
SUPPRESSION
OUT+
OUT–
MODULATOR
(Σ-Δ)
GND
10F
SD
SSM2305
37k
296k
37k
REXT
FET
DRIVER
BIAS
INTERNAL
OSCILLATOR
EXTERNAL GAIN SETTINGS = 296k/(37k + REXT)
IN+
IN–
AUDIO IN+
VBATT
2.5V TO 5.5V
47nF
Figure 33. Single-Ended Input Configuration, User-Adjustable Gain
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