參數(shù)資料
型號(hào)： SSM2211-EVAL
廠商： Analog Devices, Inc.
英文描述： Low Distortion, 1.5 W Audio Power Amplifier
中文描述： 低失真，1.5 W音頻功率放大器
文件頁(yè)數(shù)： 19/24頁(yè)
文件大小： 408K
代理商： SSM2211-EVAL
SSM2211
voltage reference. The extra supply voltage also allows the
SSM2211 to reproduce peaks in excess of 1 W without clipping
the signal. With V
DD
= 5 V and R
L
= 8 Ω, Equation 9 shows that
the maximum power dissipation for the SSM2211 is 633 mW.
From the power derating curve in Figure 31, the ambient
temperature must be less than 73°C for the SOIC and 118°C for
the LFCSP.
The required gain of the amplifier can be determined from
Equation 17 as
Rev. D | Page 19 of 24
8
=
×
=
rms
IN,
L
L
V
V
R
P
A
(17)
From Equation 1
R
2
V
I
F
A
R
=
or
R
F
= 1.4 ×
R
I
. Because the desired input impedance is 20 kΩ,
R
I
= 20 kΩ and R2 = 28 kΩ.
The final design step is to select the input capacitor. When
adding an input capacitor, C
C
, to create a high-pass filter, the
corner frequency needs to be far enough away for the design to
meet the bandwidth criteria. For a first-order filter to achieve a
pass-band response within 0.25 dB, the corner frequency must
be at least 4.14× away from the pass-band frequency. So, (4.14 ×
f
HP
) < 20 Hz. Using Equation 2, the minimum size of input
capacitor can be found.
1
C
C
×
>
14
.
4
Hz
20
kΩ
20
π
2
(18)
Therefore, C
C
> 1.65 μF. Using a 2.2 μF is a practical choice for C
C
.
The gain bandwidth product for each internal amplifier in the
SSM2211 is 4 MHz. Because 4 MHz is much greater than
4.14 × 20 kHz, the design meets the upper frequency bandwidth
criteria. The SSM2211 can also be configured for higher
differential gains without running into bandwidth limitations.
Equation 16 shows an appropriate value for C
B
to reduce start-
up popping noise.
(
μF
76
1
kΩ
25
)(
)
kΩ
20
μF
2
.
2
.
C
B
=
>
(19)
Selecting C
B
to be 2.2 μF for a practical value of capacitor
minimizes start-up popping noise.
To summarize the final design:
V
DD
5 V
R1
20 kΩ
R
F
28 kΩ
C
2.2 μF
C
B
2.2 μF
T
A, MAX
85°C
SINGLE-ENDED APPLICATIONS
There are applications in which driving a speaker differentially is
not practical, for example, a pair of stereo speakers where the
minus terminal of both speakers is connected to ground. Figure 48
shows how this can be accomplished.
SSM2211
5V
2
7
1
8
5
6
4
3
0.47
μ
F
470
μ
F
+
–
+
–
10k
Ω
10k
Ω
(8
Ω
)
INPUT
0.1
μ
F
SPEAKER
AUDIO
0
Figure 48. Single-Ended Output Application
It is not necessary to connect a dummy load to the unused
output to help stabilize the output. The 470 μF coupling
capacitor creates a high-pass frequency cutoff of 42 Hz, as given
in Equation 4, which is acceptable for most computer speaker
applications. The overall gain for a single-ended output
configuration is A
V
= R
F
/R
1
, which for this example is equal to 1.
DRIVING TWO SPEAKERS SINGLE ENDEDLY
It is possible to drive two speakers single endedly with both
outputs of the SSM2211.
SSM2211
5V
2
7
1
8
5
6
4
3
1
μ
F
470
μ
F
+
–
+
–
20k
Ω
20k
Ω
RIGHT
SPEAKER
(8
Ω
)
AUDIO
INPUT
0.1
μ
F
0
470
μ
F
+
–
LEFT
SPEAKER
(8
Ω
)
Figure 49. SSM2211 Used as a Dual-Speaker Amplifier
Each speaker is driven by a single-ended output. The trade-off
is that only 250 mW of sustained power can be put into each
speaker. Also, a coupling capacitor must be connected in series
with each of the speakers to prevent large dc currents from
flowing through the 8 Ω speakers. These coupling capacitors
produce a high-pass filter with a corner frequency given by
Equation 4. For a speaker load of 8 Ω and a coupling capacitor
of 470 μF, this results in a 3 dB frequency of 42 Hz.
Because the power of a single-ended output is one-quarter that
of a bridged output, both speakers together are still half as loud
(6 dB SPL) as a single speaker driven with a bridged output.
C
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SSM2211P 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Bulk
SSM2211S 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Bulk 制造商:Analog Devices 功能描述:IC SM AMP AUDIO POWER 1.5W
SSM2211S-REEL 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:IC AMP AUDIO
SSM2211S-REEL7 制造商:Analog Devices 功能描述:Audio Amp Speaker 1-CH Mono Class-AB 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:1 WATT AUDIO AMPLIFIER - Tape and Reel
SSM2211SZ 功能描述:IC AMP AUDIO PWR 1W MONO 8SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標(biāo)準(zhǔn)包裝:80 系列:- 類型:AB 類 輸出類型:1-通道（單聲道） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:1.25W x 1 @ 8 歐姆 電源電壓:2.5 V ~ 5.5 V 特點(diǎn):消除爆音，差分輸入，關(guān)閉，熱保護(hù) 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:8-MSOP-PowerPad 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:管件 配用:296-31419-ND - EVAL MODULE FOR TPA6205A1 其它名稱:296-34563-5TPA6205A1DGN-ND
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