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UA741MJGB Datenblatt(PDF) 11 Page - Texas Instruments |
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UA741MJGB Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 28 page 12 V + VIN VOUT 10 k To VCC – OFFSET N1 10 k OFFSET N2 + – OUT IN + IN – uA741 www.ti.com SLOS094E – NOVEMBER 1970 – REVISED JANUARY 2015 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 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 13. 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 the application note Nulling Input Offset Voltage of Operational Amplifiers, SLOA045. Figure 11. Input Offset Voltage Null Circuit 9.2 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 12. Voltage Follower Schematic 9.2.1 Design Requirements • Output range of 2 V to 11.5 V • Input range of 2 V to 11.5 V Copyright © 1970–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: uA741 |
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