參數(shù)資料
型號(hào): LM4835MT
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 音頻控制
英文描述: Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
中文描述: 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28
封裝: TSSOP-28
文件頁(yè)數(shù): 13/16頁(yè)
文件大?。?/td> 648K
代理商: LM4835MT
Application Information
(Continued)
At low frequencies the capacitor will be virtually an open cir-
cuit. At high frequencies the capacitor will be virtually a short
circuit. As a result of this, the gain of the bridge amplifier is
increased at low frequencies.Afirst order pole is formed with
a corner frequency at:
f
c
= 1/(2
π
R
LFE
C
LFE
)
The resulting low frequency differential gain of this bridged
amplifier becomes:
2(R
f
+ R
LFE
) / R
i
= A
vd
With R
= 20k
, R
= 20k
, and C
= 0.068 μF, a first
order pole is formed with a corner frequency of 120 Hz. At
low frequencies the differential gain will be 4, assuming R
S
=
20k
. The low frequency boost formulas assume that C
O
,
C
, f
, f
allow the appropriate low frequency response.
The bass boost feature is enabled/disable by toggling the
logic at pin 3.
DC VOLUME CONTROL
The DC voltage at the DC Volume Control pin (pin 7) deter-
mines the attenuation of output of the amplifiers. If the DC
potential of pin 7 is at 4V (or 80% V
) the internal amplifiers
are set at unity gain. The attenuator range is from 0dB (pin7
= 80% V
) to -81dB (pin7 = 0V). Any DC voltage greater
than 4V (or 80% V
) will result in a gain of unity. When the
mode pin is given a logic low,amplifiers will be fixed at a gain
of unity regardless of the voltage of pin 7. Refer to the
Typi-
cal Performance Characteristics
for detailed information of
the attenuation characteristics of the DC Volume Control pin.
DS100139-11
FIGURE 5. Low Frequency Enhancement
www.national.com
13
相關(guān)PDF資料
PDF描述
LM4835MTE Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
LM4836 Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux
LM4836MT Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux
LM4836MTE Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux
LM4838 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
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