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參數(shù)資料
| 型號： | LMV324M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 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： | SOIC-14 |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 1151K |
| 代理商： | LMV324M |
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Application Notes
(Continued)
In
Figure 3
, the isolation resistor R
ISO
and the load capacitor
C
L
form a pole to increase stability by adding more phase
margin to the overall system. The desired performance de-
pends on the value of R
ISO
. The bigger the R
ISO
resistor
value, the more stable V
OUT
will be.
Figure 4
is an output
waveform of
Figure 3
using 620
for R
ISO
and 510pF for C
L.
.
The circuit in
Figure 5
is an improvement to the one in
Figure
3
because it provides DC accuracy as well as AC stability. If
there were a load resistor in
Figure 3
, the output would be
voltage divided by R
and the load resistor. Instead, in
Figure 5
, R
provides the DC accuracy by using feed-
forward techniques to connect V
to R
. Caution is needed
in choosing the value of R
due to the input bias current of
the LMV321/358/324. C
and R
serve to counteract the
loss of phase margin by feeding the high frequency compo-
nent of the output signal back to the amplifier’s inverting
input, thereby preserving phase margin in the overall feed-
back loop. Increased capacitive drive is possible by increas-
ing the value of C
F
. This in turn will slow down the pulse
response.
3.0 INPUT BIAS CURRENT CANCELLATION
The LMV321/358/324 family has a bipolar input stage. The
typical input bias current of LMV321/358/324 is 15nAwith 5V
supply. Thus a 100k
input resistor will cause 1.5mV of error
voltage. By balancing the resistor values at both inverting
and non-inverting inputs, the error caused by the amplifier’s
input bias current will be reduced. The circuit in
Figure 6
shows how to cancel the error caused by input bias current.
4.0 TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS
4.1 Difference Amplifier
The difference amplifier allows the subtraction of two volt-
ages or, as a special case, the cancellation of a signal
common to two inputs. It is useful as a computational ampli-
fier, in making a differential to single-ended conversion or in
rejecting a common mode signal.
4.2 Instrumentation Circuits
The input impedance of the previous difference amplifier is
set by the resistors R
, R
, R
, and R
. To eliminate the
problems of low input impedance, one way is to use a
voltage follower ahead of each input as shown in the follow-
ing two instrumentation amplifiers.
Time (2
μ
s/div)
O
I
10006099
FIGURE 4. Pulse Response of the LMV324 Circuit in
Figure 3
10006005
FIGURE 5. Indirectly Driving A Capacitive Load with
DC Accuracy
10006006
FIGURE 6. Cancelling the Error Caused by Input Bias
Current
10006007
10006019
FIGURE 7. Difference Amplifier
L
www.national.com
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV324M | 制造商:Texas Instruments 功能描述:IC OP AMP QUAD SMD SOIC14 324 |
| LMV324M/NOPB | 功能描述:運算放大器 - 運放 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 |
| LMV324M8G-13 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:GENERAL PURPOSE, LOW VOLTAGE, RAIL-TO-RAIL |
| LMV324M8G-7 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:GENERAL PURPOSE, LOW VOLTAGE, RAIL-TO-RAIL |
| LMV324MT | 功能描述:運算放大器 - 運放 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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