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參數(shù)資料
| 型號： | SSM2211CP-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Distortion, 1.5 W Audio Power Amplifier |
| 中文描述： | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 3 X 3 MM, LFCSP-8 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 408K |
| 代理商： | SSM2211CP-REEL7 |
SSM2211
The polarity of the speakers is important, as each output is 180
degrees out of phase with the other. By connecting the minus
terminal of Speaker 1 to Pin 5, and the plus terminal of
Speaker 2 to Pin 8, proper speaker phase can be established.
The maximum power dissipation of the device, assuming both
loads are equal, can be found by doubling Equation 11. If the
loads are different, use Equation 11 to find the power dissipa-
tion caused by each load, then take the sum to find the total
power dissipated by the SSM2211.
EVALUATION BOARD
An evaluation board for the SSM2211 is available. For more
information, call 1-800-ANALOGD.
Rev. D | Page 20 of 24
Therefore, for P
O
= 1 W and R
L
= 8 Ω, V = 2.8 V rms, or
8 V p-p. If the available input signal is 1.4 V rms or more, use
the board as is, with R
F
= R
I
= 20 kΩ. If more gain is needed,
increase the value of R
F
.
When you have determined the closed-loop gain required by
your source level, and can develop 1 W across the 8 Ω load
resistor with the normal input signal level, replace the resistor
with your speaker. Your speaker can be connected across the
V
O1
and V
O2
posts for bridged-mode operation only after the
8 Ω load resistor is removed. For no phase inversion, V
O2
must
be connected to the (+) terminal of the speaker.
8
SSM2211
5
V
O2
GND
CH A
CH B
PROBES
CH B
INV. ON
DISPLAY
A+B
OSCILLOSCOPE
2.5V
COMMON
MODE
V
O1
8
Ω
1W
0
V+
8
4
SSM2211
5
3
2
1
V
O2
6
J1
J2
C1
0.1μF
7
C
IN
1μF
CW
ON
SHUTDOWN
R1
51k
+
+
R
I
20k
R
F
20k
V
O1
R
1W 8
VOLUME
20k
POT.
AUDIO
INPUT
C1
0.1μF
C2
10μF
0
Figure 51. Using an Oscilloscope to Display the Bridged-Output Voltage
Figure 50. Evaluation Board Schematic
The voltage gain of the SSM2211 is given by Equation 20.
R
A
×
=
2
I
F
V
R
(20)
To use the SSM2211 in a single-ended-output configuration,
replace J1 and J2 jumpers with electrolytic capacitors of a
suitable value, with the negative terminals to the output
terminals V
O1
and V
O2
. The single-ended loads can then be
returned to ground. Note that the maximum output power is
reduced to 250 mW (one-quarter of the rated maximum), due
to the maximum swing in the nonbridged mode being one-half
and power being proportional to the square of the voltage. For
frequency response down 3 dB at 100 Hz, a 200 μF capacitor is
required with 8 Ω speakers.
The SSM2211 evaluation board also comes with a shutdown
switch, which allows the user to switch between on (normal
operation) and the power-conserving shutdown mode.
LFCSP PRINTED CIRCUIT BOARD LAYOUT
CONSIDERATIONS
The LFCSP is a plastic encapsulated package with a copper lead
frame substrate. This is a leadless package with solder lands on
the bottom surface of the package, instead of conventional
formed perimeter leads. A key feature that allows the user to
reach the quoted θ
JA
performance is the exposed die attach
paddle (DAP) on the bottom surface of the package. When
soldered to the PCB, the DAP can provide efficient conduction
of heat from the die to the PCB. In order to achieve optimum
package performance, consideration should be given to the PCB
pad design for both the solder lands and the DAP. For further
information the user is directed to the Amkor Technology
document, “Application Notes for Surface Mount Assembly of
Amkor’s MicroLead Frame (MLF) Packages.” This can be
downloaded from the Amkor Technology website,
www.amkor.com, as a product application note.
If desired, the input signal may be attenuated by turning the
10 kΩ potentiometer in the CW (clockwise
)
direction. C
IN
isolates the input common-mode voltage (V
D
/2) present at Pin 2
and Pin 3. With V+ = 5 V, there is 2.5 V common-mode voltage
present at both output terminals, V
O1
and V
O2
, as well.
CAUTION: The ground lead of the oscilloscope probe, or any
other instrument used to measure the output signal, must not
be connected to either output, as this shorts out one of the
amplifier outputs and can possibly damage the device.
A safe method of displaying the differential output signal using a
grounded scope is shown in Figure 51. Connect Channel A probe
to the V
O2
terminal post. Connect Channel B probe to the V
O1
post. Invert Channel B, and add the two channels together. Most
multichannel oscilloscopes have this feature built in. If you must
connect the ground lead of the test instrument to either output
signal pins, a power-line isolation transformer must be used to
isolate the instrument ground from the power supply ground.
Recall that
R
P
V
×
=
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|---|---|
| SSM2211CPZ-R2 | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 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:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| SSM2211CPZ-R21 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Distortion, 1.5 W Audio Power Amplifier |
| SSM2211CPZ-REEL | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:AB 類 輸出類型:2 通道（立體聲） 在某負(fù)載時最大輸出功率 x 通道數(shù)量:- 電源電壓:4 V ~ 18 V 特點(diǎn):- 安裝類型:通孔 供應(yīng)商設(shè)備封裝:8-DIP 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 |
| SSM2211CPZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Distortion, 1.5 W Audio Power Amplifier |
| SSM2211CPZ-REEL7 | 功能描述:IC AMP AUDIO PWR 1W MONO 8LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:AB 類 輸出類型:2 通道（立體聲） 在某負(fù)載時最大輸出功率 x 通道數(shù)量:- 電源電壓:4 V ~ 18 V 特點(diǎn):- 安裝類型:通孔 供應(yīng)商設(shè)備封裝:8-DIP 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 |
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