參數(shù)資料
型號(hào)： LM4841
廠商： National Semiconductor Corporation
英文描述： Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
中文描述： 2W的立體聲放大器直流音量控制，瞬態(tài)自由輸出，無(wú)電容耳機(jī)驅(qū)動(dòng)器
文件頁(yè)數(shù)： 20/31頁(yè)
文件大?。?/td> 1138K
代理商： LM4841
Application Information
(Continued)
At low, frequencies C
BA
is a virtual open circuit and at high
frequencies, its nearly zero ohm impedance shorts R
BA
. The
result is increased bridge-amplifier gain at low frequencies.
The combination of R
BA
and C
BA
form a -6dB corner fre-
quency at
f
C
= 1/(2
π
R
BA
C
BA
)
(9)
The bridged-amplifier low frequency differential gain is:
A
VD
= 2(R
GFA
+ R
BA
) / R
GIA
(10)
Using the component values shown in
Figure 2
(R
=
20k
, R
= 20k
, and C
= 0.068μF), a first-order, -6dB
pole is created at 120Hz. Assuming R
= 20k
, the low
frequency differential gain is 4. The input (C
) capaci-
tor values must be selected for a low frequency response
that covers the range of frequencies affected by the desired
bass-boost operation.
DC VOLUME CONTROL
The LM4841 has an internal stereo volume control whose
setting is a function of the DC voltage applied to the DC VOL
CONTROL pin.
The LM4841 volume control consists of 31 steps that are
individually selected by a variable DC voltage level on the
volume control pin. The range of the steps, controlled by the
DC voltage, are from 0dB - 78dB. Each gain step corre-
sponds to a specific input voltage range, as shown in table 2,
(on the following page.)
To minimize the effect of noise on the volume control pin,
which can affect the selected gain level, hysteresis has been
implemented. The amount of hysteresis corresponds to half
of the step width, as shown in Volume Control Characteriza-
tion Graph (DS200133-40).
For highest accuracy, the voltage shown in the ’recom-
mended voltage’ column of the table is used to select a
desired gain. This recommended voltage is exactly halfway
between the two nearest transitions to the next highest or
next lowest gain levels.
The gain levels are 1dB/step from 0dB to -6dB, 2dB/step
from -6dB to -36dB, 3dB/step from -36dB to -47dB, 4dB/step
from -47db to -51dB, 5dB/step from -51dB to -66dB, and
12dB to the last step at -78dB.
20028011
FIGURE 7. Low Frequency Enhancement ( MT/MH PINOUT )
L
www.national.com
20
相關(guān)PDF資料
PDF描述
LM4841LQ Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
LM4841MH Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
LM4841MT Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
LM4842 Stereo 2W Amplifiers with DC Volume Control Transient Free Outputs, and Cap-less Headphone Drive
LM4842LQ Stereo 2W Amplifiers with DC Volume Control Transient Free Outputs, and Cap-less Headphone Drive
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM48410 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low EMI, Filterless, 2.3W Stereo Class D Audio Power Amplifier with National 3D Enhancement
LM48410SQ 制造商:Texas Instruments 功能描述:Audio Amp Speaker 2-CH Stereo 2.3W Class-D 24-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:AMP, POWER, CLASS D, 2.3W, LLP-24
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LM48410SQBD 功能描述:音頻 IC 開(kāi)發(fā)工具 LM48410 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
LM48410SQE/NOPB 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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