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參數(shù)資料
| 型號： | LMV982 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.8V, RRIO Operational Amplifiers with Shutdown |
| 中文描述： | 1.8，RRIO運算放大器，帶有關斷 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 585K |
| 代理商： | LMV982 |
Typical Applications
(Continued)
5.0 HALF-WAVE RECTIFIER WITH RAIL-TO-GROUND
OUTPUT SWING
Since the LMV981/LMV982 input common mode range in-
cludes both positive and negative supply rails and the output
can also swing to either supply, achieving half-wave rectifier
functions in either direction is an easy task.All that is needed
are two external resistors; there is no need for diodes or
matched resistors. The half wave rectifier can have either
positive or negative going outputs, depending on the way the
circuit is arranged.
In
Figure 3
the circuit is referenced to ground, while in
Figure
4
the circuit is biased to the positive supply. These configu-
rations implement the half wave rectifier since the LMV981/
LMV982 can not respond to one-half of the incoming wave-
form. It can not respond to one-half of the incoming because
the amplifier can not swing the output beyond either rail
therefore the output disengages during this half cycle. Dur-
ing the other half cycle, however, the amplifier achieves a
half wave that can have a peak equal to the total supply
voltage. R
I
should be large enough not to load the
LMV981/LMV982.
6.0 INSTRUMENTATION AMPLIFIER WITH
RAIL-TO-RAIL INPUT AND OUTPUT
Some manufactures make a non-“rail-to-rail”-op amp rail-to-
rail by using a resistive divider on the inputs. The resistors
divide the input voltage to get a rail-to-rail input range. The
problem with this method is that it also divides the signal, so
in order to get the obtained gain, the amplifier must have a
higher closed loop gain. This raises the noise and drift by the
internal gain factor and lowers the input impedance. Any
mismatch in these precision resistors reduces the CMRR as
well. The LMV981/LMV982 is rail-to-rail and therefore
doesn’t have these disadvantages.
Using three of the LMV981/LMV982 amplifiers, an instru-
mentation amplifier with rail-to-rail inputs and outputs can be
made as shown in
Figure 5
.
In this example, amplifiers on the left side act as buffers to
the differential stage. These buffers assure that the input
impedance is very high and require no precision matched
resistors in the input stage. They also assure that the differ-
ence amp is driven from a voltage source. This is necessary
to maintain the CMRR set by the matching R
-R
with R
-R
4
.
The gain is set by the ratio of R
/R
and R
should equal R
1
and R
equal R
. With both rail-to-rail input and output
ranges, the input and output are only limited by the supply
voltages. Remember that even with rail-to-rail outputs, the
output can not swing past the supplies so the combined
common mode voltages plus the signal should not be
greater that the supplies or limiting will occur. For additional
applications, see National Semiconductor application notes
AN–29, AN–31, AN–71, and AN–127.
200214C3
200214C2
200214C4
FIGURE 3. Half-Wave Rectifier with Rail-To-Ground Output Swing Referenced to Ground
200214C0
200214B9
200214C1
FIGURE 4. Half-Wave Rectifier with Negative-Going Output Referenced to V
CC
200214G4
FIGURE 5. Rail-to-rail instrumentation amplifier
L
www.national.com
14
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMV982DMR2G | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Single and Dual Low Voltage, Rail-to-Rail Input and Output, Operational Amplifiers with Shutdown |
| LMV982IDGSR | 功能描述:運算放大器 - 運放 Dual 1.8V w/R-to-R I/O & Shutdown 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV982IDGSRE4 | 功能描述:運算放大器 - 運放 Dual 1.8V w/R-to-R I/O & Shutdown 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV982IDGSRG4 | 功能描述:運算放大器 - 運放 Dual 1.8V w/R-to-R I/O & Shutdown 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV982IDGST | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8-V OPERATIONAL AMPLIFIERS WITH RAIL-TO-RAIL AND OUTPUT AND SHUTDOWN |
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