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OP07DDRE4 Datenblatt(PDF) 8 Page - Texas Instruments |
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OP07DDRE4 Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 21 page 12 V + VIN VOUT 10 k OUT VCC VCC+ IN− IN+ + − OFFSET N1 3 2 4 7 6 20 k Ω N2 OFFSET 8 1 – OP07C, OP07D SLOS099G – OCTOBER 1983 – REVISED NOVEMBER 2014 www.ti.com 10 Application and Implementation 10.1 General Application The input offset voltage of operational amplifiers (op amps) arises from unavoidable mismatches in the differential input stage of the op-amp circuit caused by mismatched transistor pairs, collector currents, current- gain betas ( β), collector or emitter resistors, etc. The input offset pins allow the designer to adjust for these mismatches by external circuitry. These input mismatches can be adjusted by putting resistors or a potentiometer between the inputs as shown in Figure 2. A potentiometer can be used to fine tune the circuit during testing or for applications which require precision offset control. More information about designing using the input-offset pins, see Nulling Input Offset Voltage of Operational Amplifiers (SLOA045). Figure 2. Input Offset-Voltage Null Circuit 10.2 Typical Application The voltage follower configuration of the operational amplifier is used for applications where a weak signal is used to drive a relatively high current load. This circuit is also called a buffer amplifier or unity gain amplifier. The inputs of an operational amplifier have a very high resistance which puts a negligible current load on the voltage source. The output resistance of the operational amplifier is almost negligible, so it can provide as much current as necessary to the output load. Figure 3. Voltage Follower Schematic 8 Submit Documentation Feedback Copyright © 1983–2014, Texas Instruments Incorporated Product Folder Links: OP07C OP07D |
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