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參數(shù)資料
| 型號(hào)： | LMC272CN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | CMOS Dual Low Cost Rail to Rail Output Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 9000 uV OFFSET-MAX, 1.9 MHz BAND WIDTH, DIP8 |
| 封裝： | 0.300 INCH, MDIP-8 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 458K |
| 代理商： | LMC272CN |
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Application Information
(Continued)
TABLE 1. Equivalent Input Noise Voltage, e
n
, for Two Different Values of R1
R1
270
1000
mA
nV/
√
Hz
e
n
(1 kHz)
2.0
2.4
I
C
(Q1, 3)
1.85
0.50
e
n
(100 Hz)
3.2
5.3
e
n
(10 kHz)
1.7
1.9
Here is another application for the LMC272. This is a single
supply notch filter set for 60 Hz using the component values
shown, but the frequency can be changed using the equa-
tions below. The main feature of this circuit is its ability to ad-
just the filter selectivity (Q) using RPOT. You can trade off
notch depth for Q. Table 2 shows data for two different set-
tings. The LMC272 lends itself nicely to general purpose ap-
plications like this because it is very well behaved and easy
to use. This filter can operate from 2.7V to 15V supplies.
Component value matching is important to achieve good re-
sults. Here R4 is used to set the input to within the common
mode range of the device to allow maximum swing on the
non-inverting input (pin 3). Since R1, R2, and R4 form a volt-
age divider at low frequencies, C4 is added to introduce a
high frequency attenuation in conjunction with C1, and C3.
R5 and R6 were picked to set the pass band gain to 0 dB.
R = R1 = R2 = 2R3
C = C1 = C3 = C2/2
TABLE 2. Filter Selectivity (Q) vs Notch Depth
(dB)
Q
0.3
6
Notch Depth
40
17
Single Supply Twin-T Notch Filter with “Q” Adjustment
DS012867-3
www.national.com
13
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