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參數資料
| 型號： | LMV324MT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 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： | TSSOP-14 |
| 文件頁數： | 16/27頁 |
| 文件大小： | 1151K |
| 代理商： | LMV324MT |
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Application Notes
(Continued)
Note that the single-op-amp active filters are used in to the
applications that require low quality factor, Q(
≤
10), low
frequency (
≤
5 kHz), and low gain (
≤
10), or a small value for
the product of gain times Q (
≤
100). The op amp should have
an open loop voltage gain at the highest frequency of inter-
est at least 50 times larger than the gain of the filter at this
frequency. In addition, the selected op amp should have a
slew rate that meets the following requirement:
Slew Rate
≥
0.5 x (
ω
H
V
OPP
) x 10
6
V/μsec
where
ω
H
is the highest frequency of interest, and V
opp
is the
output peak-to-peak voltage.
4.4.2 Sallen-Key 2nd-Order Active Low-Pass Filter
The Sallen-Key 2nd-order active low-pass filter is illustrated
in
Figure 13
. The dc gain of the filter is expressed as
(1)
Its transfer function is
(2)
The following paragraphs explain how to select values for
R
, R
2
, R
, R
, C
1
, and C
2
for given filter requirements, such
as A
LP
, Q, and f
c
.
The standard form for a 2nd-order low pass filter is
(3)
where
Q: Pole Quality Factor
ω
C
: Corner Frequency
Comparison between the
Equation (2)
and
Equation (3)
yields
(4)
(5)
To reduce the required calculations in filter design, it is
convenient to introduce normalization into the components
and design parameters. To normalize, let
ω
=
ω
= 1rad/s,
and C
= C
= C
= 1F, and substitute these values into
Equation (4)
and
Equation (5)
. From
Equation (4)
, we obtain
(6)
From
Equation (5)
, we obtain
(7)
10006014
10006037
FIGURE 11. Simple Low-Pass Active Filter
10006015
FIGURE 12. Frequency Response of Simple Low-Pass
Active Filter in Figure 11
10006016
FIGURE 13. Sallen-Key 2nd-Order Active Low-Pass
Filter
L
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMV324MT/NOPB | 功能描述:運算放大器 - 運放 Low Volt Quad Op Amp RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV324MT/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMV324MTCX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV324MTX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV324MTX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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