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參數(shù)資料
| 型號： | LMV716MM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 5 MHz, Low Noise, RRO, Dual Operational Amplifier with CMOS Input |
| 中文描述： | DUAL OP-AMP, 5000 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 953K |
| 代理商： | LMV716MM |
Application Information
(Continued)
Now looking at the output of the instrumentation amplifier:
(5)
Substituting from
Equation (4)
:
(6)
This shows the gain of the instrumentation amplifier to be:
K(2a+1)
Typical values for this circuit can be obtained by setting: a =
12 and K = 4. This results in an overall gain of 100.
Three LMV716 amplifiers are used along with 1% resistors
to minimize resistor mismatch. Resistors used to build the
circuit are: R
= 21.6 k
, R
= 1.8 k
, R
= 2.5 k
with K =
40 and a = 12. This results in an overall gain of K(2a+1) =
1000.
Two-Op-Amp Instrumentation Amplifier
A two-op-amp instrumentation amplifier can also be used to
make a high-input impedance DC differential amplifier
Figure
6
). As in the three op amp circuit, this instrumentation am-
plifier requires precise resistor matching for good CMRR. R
4
should be equal to R
1
, and R
3
should equal R
2
.
ACTIVE FILTERS
Active filters are circuits with amplifiers, resistors, and ca-
pacitors. The use of amplifiers instead of inductors, which
are used in passive filters, enhances the circuit performance
while reducing the size and complexity of the filter. The
simplest active filters are designed using an inverting op
amp configuration where at least one reactive element has
been added to the configuration. This means that the op amp
will provide "frequency-dependent" amplification, since reac-
tive elements are frequency dependent devices.
Low Pass Filter
The following shows a very simple low pass filter.
The transfer function can be expressed as follows:
By KCL:
(7)
Simplifying this further results in:
(8)
or
(9)
Now, substituting
ω
=2
π
f, so that the calculations are in f(Hz)
rather than in
ω
(rad/s), and setting the DC gain
and
(10)
set:
(11)
Low pass filters are known as lossy integrators because they
only behave as integrators at higher frequencies. The gen-
eral form of the bode plot can be predicted just by looking at
the transfer function. When the f/f
ratio is small, the capaci-
tor is, in effect, an open circuit and the amplifier behaves at
a set DC gain. Starting at f
, which is the 3 dB corner, the
capacitor will have the dominant impedance and hence the
circuit will behave as an integrator and the signal will be
attenuated and eventually cut. The bode plot for this filter is
shown in
Figure 8
.
20179513
FIGURE 6. Two-Op-Amp Instrumentation Amplifier
20179553
FIGURE 7. Low Pass Filter
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV716MM/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 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 |
| LMV716MMX | 功能描述:運(yùn)算放大器 - 運(yùn)放 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 |
| LMV716MMX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 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 |
| LMV717A EA WAF | 制造商:Texas Instruments 功能描述: |
| LMV721 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
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