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參數(shù)資料
| 型號(hào)： | SSM2302CPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 1.4W STER D 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 1.4W x 2 @ 8 歐姆 |
| 電源電壓： | 2.5 V ~ 5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，短路和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，CSP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 764 (CN2011-ZH PDF) |
| 配用： | SSM2302Z-EVAL-ND - BOARD EVAL FOR SSM2302 |
| 其它名稱： | SSM2302CPZ-REEL7DKR |
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SSM2302
Rev. 0 | Page 12 of 20
APPLICATION NOTES
OVERVIEW
The SSM2302 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 SSM2302 does not require an output filter, but instead relies
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. While most Class-D ampli-
fiers use some variation of pulse-width modulation (PWM), the
SSM2302 uses a Σ-Δ modulation to determine the switching
pattern of the output devices. This provides a number of important
benefits. Σ-Δ modulators do not produces 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. The SSM2302 also offers
protection circuits for overcurrent and temperature protection.
GAIN SELECTION
Pulling the GAIN pin high of the SSM2302 sets the gain of the
speaker amplifier to 12 dB; pulling it low sets the gain of the
speaker amplifier to 6 dB.
It is possible to adjust the SSM2302 gain by using external resistors
at the input. To set a gain lower than 12 dB refer to Figure 22 for
differential input configuration and Figure 23 for single-ended
configuration. For external gain configuration from a fixed 12 dB
gain, please use the following formula:
External Gain Settings = 20 log[4/(1 + R/150 kΩ)]
To set a gain lower than 6 dB refer to Figure 24 for differential
input configuration and Figure 25 for single-ended configuration.
For external gain configuration from a fixed 6 dB gain, use the
following formula:
External Gain Settings = 20 log[2/(1 + R/150 kΩ)]
POP-AND-CLICK SUPPRESSION
Voltage transients at the output of audio amplifiers can occur when
shutdown is activated or deactivated. Voltage transients as low
as 10 mV can be heard as an audio pop in the speaker. Clicks
and pops can also be classified as undesirable audible transients
generated by the amplifier system, therefore as not coming from
the system input signal. Such transients can be generated when
the amplifier system changes its operating mode. For example, the
following can be sources of audible transients: system power-up/
power-down, mute/unmute, input source change, and sample rate
change. The SSM2302 has a pop-and-click suppression architecture
that reduces this output transients, resulting in noiseless activation
and deactivation.
EMI NOISE
The SSM2302 uses a proprietary modulation and spread-
spectrum technology to minimize EMI emissions from the
device. Figure 26 shows SSM2302 EMI emission starting from
100 kHz to 30 MHz. Figure 27 shows SSM2302 EMI emission
from 30 kHz to 2 GHz. These figures clearly describe the SSM2302
EMI behavior as being well below the FCC regulation values,
starting from 100 kHz and passing beyond 1 GHz of frequency.
Although the overall EMI noise floor is slightly higher, frequency
spurs from the SSM2302 are greatly reduced.
06
05
1-
03
2
70
0
0.1
100
FREQUENCY (MHz)
LE
V
E
L
(
d
B
(
V
/m
))
60
50
40
30
20
10
110
= HORIZONTAL
= VERTICAL
= REGULATION VALUE
Figure 26. EMI Emissions from SSM2302
06
05
1-
03
3
70
0
10
10k
FREQUENCY (MHz)
LE
V
E
L
(
d
B
(
V
/m
))
60
50
40
30
20
10
100
1k
= HORIZONTAL
= VERTICAL
= REGULATION VALUE
Figure 27. EMI Emissions from SSM2302
a 1 kHz input signal, producing 0.5 W output power into an 8 Ω
load from a 3.6 V supply. Cable length was approximately 5 cm.
The EMI was detected using a magnetic probe touching the 2”
output trace to the load.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SSM2302N | 制造商:SSC 制造商全稱:Silicon Standard Corp. 功能描述:N-CHANNEL ENHANCEMENT-MODE POWER MOSFET |
| SSM2302Z-EVAL | 功能描述:BOARD EVAL FOR SSM2302 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| SSM2303N | 制造商:SSC 制造商全稱:Silicon Standard Corp. 功能描述:P-CHANNEL ENHANCEMENT-MODE POWER MOSFET |
| SSM2304 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2 W Filterless Class-D Stereo Audio Amplifier |
| SSM2304AGN | 制造商:SSC 制造商全稱:Silicon Standard Corp. 功能描述:N-CHANNEL ENHANCEMENT-MODE POWER MOSFET |
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