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LMV721M7 Datasheet(PDF) 11 Page - Texas Instruments |
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LMV721M7 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page 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 Submit Documentation Feedback 11 Product Folder Links: LMV721-N LMV722-N |
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