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參數(shù)資料
| 型號(hào)： | 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)： | 10/15頁 |
| 文件大?。?/td> | 953K |
| 代理商： | LMV716MM |
Application Information
(Continued)
SINGLE-SUPPLY INVERTING AMPLIFIER
There may be cases where the input signal going into the
amplifier is negative. Because the amplifier is operating in
single supply voltage, a voltage divider using R
and R
is
implemented to bias the amplifier so the inverting input
signal is within the input common voltage range of the am-
plifier. The capacitor C
1
is placed between the inverting input
and resistor R
1
to block the DC signal going into the AC
signal source, V
IN
. The values of R
1
and C
1
affect the cutoff
frequency, fc =
1
2
π
R
1
C
1
. As a result, the output signal is
centered around mid-supply (if the voltage divider provides
V
+
/2 at the non-inverting input). The output can swing to both
rails, maximizing the signal-to-noise ratio in a low voltage
system.
INSTRUMENTATION AMPLIFIER
Measurement of very small signals with an amplifier requires
close attention to the input impedance of the amplifier, the
overall signal gain from both inputs to the output, as well as,
the gain from each input to the output. This is because we
are only interested in the difference of the two inputs and the
common signal is considered noise. A classic solution is an
instrumentation amplifier. Instrumentation amplifiers have a
finite, accurate, and stable gain. Also they have extremely
high input impedances and very low output impedances.
Finally they have an extremely high CMRR so that the
amplifier can only respond to the differential signal.
Three-Op-Amp Instrumentation Amplifier
A typical instrumentation amplifier is shown in
Figure 5
.
There are two stages in this configuration. The last stage,
the output stage, is a differential amplifier. In an ideal case
the two amplifiers of the first stage, the input stage, would be
set up as buffers to isolate the inputs. However they cannot
be connected as followers due to the mismatch of real
amplifiers. The circuit in
Figure 5
utilizes a balancing resistor
between the two amplifiers to compensate for this mismatch.
The product of the two stages of gain will be the gain of the
instrumentation amplifier circuit. Ideally, the CMRR should
be infinite. However the output stage has a small non-zero
common mode gain which results from resistor mismatch.
In the input stage of the circuit, current is the same across all
resistors. This is due to the high input impedance and low
input bias current of the LMV716. With the node equations
we have:
(1)
By Ohm’s Law:
(2)
However:
(3)
So we have:
(4)
20179515
FIGURE 4. Single-supply Inverting Amplifier
20179542
FIGURE 5. Three-Op-Amp Instrumentation Amplifier
L
www.national.com
10
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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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