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參數(shù)資料
| 型號： | LMV921 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.8V, 1MHz, Low Power Operational Amplifiers with Rail-To-Rail Input and Output |
| 中文描述： | 1.8，1MHz的，低功耗運算放大器具有軌至軌輸入和輸出 |
| 文件頁數(shù)： | 18/27頁 |
| 文件大小： | 736K |
| 代理商： | LMV921 |
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Typical Applications
(Continued)
2.0 Instrumentation Amplifier with Rail-To-Rail Input and
Output
Using three of the LMV924 Amplifiers, an instrumentation
amplifier with rail-to-rail inputs and outputs can be made.
Some manufacturers use a precision voltage divider array of
5 resistors to divide the common mode 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 unity gain, the am-
plifier must be run at high loop gains. This raises the noise
and drift by the internal gain factor and lowers the input im-
pedance. Any mismatch in these precision resistors reduces
the CMRR as well. Using the LMV924 eliminates all of these
problems.
In this example, amplifiers A and B act as buffers to the dif-
ferential stage. These buffers assure that the input imped-
ance is very high and require no precision matched resistors
in the input stage. They also assure that the difference amp
is driven from a voltage source. This is necessary to main-
tain the CMRR set by the matching R
1
-R
2
with R
3
-R
4
.
The gain is set by the ratio of R
2
/R
1
and R
3
should equal R
1
and R
4
equal R
2
.
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 lim-
iting will occur. For additional applications, see National
Semiconductor application notes AN–29, AN–31, AN–71,
and AN–127.
DS100979-G4
FIGURE 7. Rail-to-rail instrumentation amplifier
L
www.national.com
18
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMV921_QUAL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.8V RR I/O Op Amp |
| LMV921A WAF | 制造商:Texas Instruments 功能描述: |
| LMV921EVAL | 功能描述:EVALUATION BOARD FOR LMV921 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| LMV921M5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMV921M5X | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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