參數(shù)資料
型號(hào)： LMV324MX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： General Purpose, Low Voltage, Rail-to-Rail Output Operational Amplifiers
中文描述： QUAD OP-AMP, 9000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 17/27頁(yè)
文件大?。?/td> 1151K
代理商： LMV324MX
Application Notes
(Continued)
For minimum dc offset, V
+
= V
, the resistor values at both
inverting and non-inverting inputs should be equal, which
means
(8)
From
Equation (1)
and
Equation (8)
, we obtain
(9)
(10)
The values of C
1
and C
2
are normally close to or equal to
As a design example:
Require: A
LP
= 2, Q = 1, fc = 1KHz
Start by selecting C
1
and C
2
. Choose a standard value that
is close to
From
Equations (6), (7), (9), (10)
,
R
1
= 1
R
2
= 1
R
3
= 4
R
4
= 4
The above resistor values are normalized values with
ω
=
1rad/s and C
= C
= C
= 1F. To scale the normalized cut-off
frequency and resistances to the real values, two scaling
factors are introduced, frequency scaling factor (k
f
) and im-
pedance scaling factor (k
m
).
Scaled values:
R
2
= R
1
= 15.9 k
R
3
= R
4
= 63.6 k
C
1
= C
2
= 0.01 μF
An adjustment to the scaling may be made in order to have
realistic values for resistors and capacitors. The actual value
used for each component is shown in the circuit.
4.4.3 2nd-order High Pass Filter
A 2nd-order high pass filter can be built by simply inter-
changing those frequency selective components (R
1
, R
2
,
C
1
, C
2
) in the Sallen-Key 2nd-order active low pass filter. As
shown in
Figure 14
, resistors become capacitors, and ca-
pacitors become resistors. The resulted high pass filter has
the same corner frequency and the same maximum gain as
the previous 2nd-order low pass filter if the same compo-
nents are chosen.
4.4.4 State Variable Filter
A state variable filter requires three op amps. One conve-
nient way to build state variable filters is with a quad op amp,
such as the LMV324 (
Figure 15
).
This circuit can simultaneously represent a low-pass filter,
high-pass filter, and bandpass filter at three different outputs.
The equations for these functions are listed below. It is also
called "Bi-Quad" active filter as it can produce a transfer
function
which
is
quadratic
denominator.
in
both
numerator
and
10006083
FIGURE 14. Sallen-Key 2nd-Order Active High-Pass
Filter
L
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMV324MX/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)放 GEN PURP, LOW VLTG, RRO OP AMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMV324PW 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
LMV324Q1 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
LMV324-Q1 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
LMV324Q1MA/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)放 Auto Quad Lo-Vtg RR Output Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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