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LMV722M データシート(PDF) 11 Page - Texas Instruments

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部品番号 LMV722M
部品情報  10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier
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ホームページ  http://www.ti.com
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LMV722M データシート(HTML) 11 Page - Texas Instruments

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LMV721-N, LMV722-N
www.ti.com
SNOS414I – AUGUST 1999 – REVISED AUGUST 2013
TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS
Difference Amplifier
The difference amplifier allows the subtraction of two voltages or, as a special case, the cancellation of a signal
common to two inputs. It is useful as a computational amplifier, in making a differential to single-ended
conversion or in rejecting a common mode signal.
Figure 27. Difference Application
(1)
(2)
Instrumentation Circuits
The input impendance of the previous difference amplifier is set by the resistor R1, R2, R3 and R4. To eliminate
the problems of low input impendance, one way is to use a voltage follower ahead of each input as shown in the
following two instrumentation amplifiers.
Three-op-amp Instrumentation Amplifier
The LMV721-N/722 can be used to build a three-op-amp instrumentation amplifier as shown in Figure 28
Figure 28. Three-op-amp Instrumentation Amplifier
The first stage of this instrumentation amplifier is a differential-input, differential-output amplifier, with two voltage
followers. These two voltage followers assure that the input impedance is over 100M
Ω. The gain of this
instrumentation amplifier is set by the ratio of R2/R1. R3 should equal R1 and R4 equal R2. Matching of R3 to R1
and R4 to R2 affects the CMRR. For good CMRR over temperature, low drift resistors should be used. Making R4
slightly smaller than R2 and adding a trim pot equal to twice the difference between R2 and R4 will allow the
CMRR to be adjusted for optimum.
Copyright © 1999–2013, Texas Instruments Incorporated
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