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UA741MJB Folha de dados(PDF) 11 Page - Texas Instruments

Nome de Peças UA741MJB
Descrição Electrónicos  General-Purpose Operational Amplifiers
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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UA741MJB Folha de dados(HTML) 11 Page - Texas Instruments

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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
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