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參數(shù)資料
| 型號(hào)： | LMV324MT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)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(yè)數(shù)： | 15/27頁(yè) |
| 文件大小： | 1151K |
| 代理商： | LMV324MT |
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Application Notes
(Continued)
4.2.1 Three-Op-Amp Instrumentation Amplifier
The quad LMV324 can be used to build a three-op-amp
instrumentation amplifier as shown in
Figure 8
.
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 100 M
. The gain of this instrumen-
tation amplifier is set by the ratio of R2/R1. R
3
should equal
R
, and R
equal R
. Matching of R
to R
and R
to R
2
affects the CMRR. For good CMRR over temperature, low
drift resistors should be used. Making R
slightly smaller
than R
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 9
) . 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 R3 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-mode voltage range of the amplifier. The
capacitor C
1
is placed between the inverting input and resis-
tor R
1
to block the DC signal going into theAC 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.
4.4 ACTIVE FILTER
4.4.1 Simple Low-Pass Active Filter
The simple low-pass filter is shown in
Figure 11
. Its low-
frequency gain (
ω →
0) is defined by -R
/R
. This allows
low-frequency gains other than unity to be obtained. The
filter 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 bias current. The frequency
response of the filter is shown in
Figure 12
.
10006085
FIGURE 8. Three-op-amp Instrumentation Amplifier
10006011
10006035
FIGURE 9. Two-Op-amp Instrumentation Amplifier
10006013
10006020
FIGURE 10. Single-Supply Inverting Amplifier
L
www.national.com
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV324MT/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Volt Quad Op Amp 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 |
| LMV324MT/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMV324MTCX | 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 |
| LMV324MTX | 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 |
| LMV324MTX/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 |
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