- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄358938 > LPV324MTX (NATIONAL SEMICONDUCTOR CORP) General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers PDF資料下載
參數(shù)資料
| 型號(hào)： | LPV324MTX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 運(yùn)算放大器 |
| 英文描述： | General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 10000 uV OFFSET-MAX, 0.152 MHz BAND WIDTH, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁(yè)數(shù)： | 11/21頁(yè) |
| 文件大?。?/td> | 715K |
| 代理商： | LPV324MTX |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)
Application Notes
(Continued)
4.2 Instrumentation Circuits
The input impedance of the previous difference amplifier is
set by the resistor R
, R
, R
, and R
. To eliminate the prob-
lems of low input impedance, one way is to use a voltage fol-
lower ahead of each input as shown in the following two in-
strumentation amplifiers.
4.2.1Three-op-amp Instrumentation Amplifier
The quad LPV324 can be used to build a three-op-amp in-
strumentation amplifier as shown in Figure 6
The first stage of this instrumentation amplifier is a
differential-input, differential-output amplifier, with two volt-
age followers. These two voltage followers assure that the
input impedance is over 100M
. The gain of this instrumen-
tation amplifier is set by the ratio of R
/R
1
. R
should equal
R
and R
equal R
. Matching of R
to R
and R
to R
af-
fects the CMRR. For good CMRR over temperature, low drift
resistors should be used. Making R
Slightly smaller than R
2
and adding a trim pot equal to twice the difference between
R
2
and R
4
will allow the CMRR to be adjusted for optimum.
4.2.2 Two-op-amp Instrumentation Amplifier
A two-op-amp instrumentation amplifier can also be used to
make a high-input-impedance DC differential amplifier (Fig-
ure 7). As in the three-op-amp circuit, this instrumentation
amplifier requires precise resistor matching for good CMRR.
R
4
should equal to R
1
and R
3
should equal R
2
.
4.3 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 input signal is within
the input common-common voltage range of the amplifier.
The capacitor C
is placed between the inverting input and
resistor R
1
to block the DC signal going into the AC signal
source, V
. The values of R
1
and C
1
affect the cutoff fre-
quency, fc = 1/2
π
R
1
C
1
.
As a result, the ouptut signal is centered around mid-supply
(if the voltage divider provides V
+
/2 at the non-inverting in-
put). The output can swing to both rails, maximizing the
signal-to-noise ratio in a low voltage system.
4.4 Active Filter
4.4.1 Simple Low-Pass Active Filter
The simple low-pass filter is shown in Figure 9 Its
low-frequency gain(
ω →
o) is defined by R
/R
. This allows
low-frequency gains other than unity to be obtained. The fil-
ter has a 20dB/decade roll-off after its corner frequency fc.
R
should be chosen equal to the parallel combination of R
1
and R
to minimize errors due to bais current. The frequency
response of the filter is shown in Figure 10
DS100920-7
FIGURE 5. Difference Amplifier
DS100920-85
FIGURE 6. Three-op-amp Instrumentation Amplifier
DS100920-11
FIGURE 7. Two-op-amp Instrumentation Amplifier
DS100920-13
FIGURE 8. Single-Supply Inverting Amplifier
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LPV324MX | General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers |
| LPV511 | 880 nA, Rail-to-Rail Input and Output Operational Amplifier |
| LPV511MG | 880 nA, Rail-to-Rail Input and Output Operational Amplifier |
| LPV511MGX | 880 nA, Rail-to-Rail Input and Output Operational Amplifier |
| LPV7215 | 580 nA Rail-to-Rail Input and Output, 1.8V, Push-Pull Output Comparator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPV324MTX/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 |
| LPV324MX | 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 |
| LPV324MX NOPB | 制造商:National Semiconductor 功能描述:OP Amp Quad GP R-R O/P 5V 14-Pin SOIC T/R 制造商:National Semiconductor 功能描述:OP Amp Quad GP R-R O/P 5V 14-Pin SOIC N T/R |
| LPV324MX/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 |
| LPV324-N | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LPV321-N Single/LPV358 Dual/LPV324 Quad General Purpose, Low Voltage, Low Power, |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。