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LM741 bảng dữ liệu(PDF) 9 Page - Texas Instruments

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LM741 bảng dữ liệu(HTML) 9 Page - Texas Instruments

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LM741
-
+ V-
V+
+Vsupply
R1 = 4.7k
Vinput
Output
R2 = 4.7k
-Vsupply
LM741
www.ti.com
SNOSC25D – MAY 1998 – REVISED OCTOBER 2015
8 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.
8.1 Application Information
The LM741 is a general-purpose amplifier than can be used in a variety of applications and configurations. One
common configuration is in a noninverting amplifier configuration. In this configuration, the output signal is in
phase with the input (not inverted as in the inverting amplifier configuration), the input impedance of the amplifier
is high, and the output impedance is low. The characteristics of the input and output impedance is beneficial for
applications that require isolation between the input and output. No significant loading will occur from the
previous stage before the amplifier. The gain of the system is set accordingly so the output signal is a factor
larger than the input signal.
8.2 Typical Application
Figure 1. LM741 Noninverting Amplifier Circuit
8.2.1 Design Requirements
As shown in Figure 1, the signal is applied to the noninverting input of the LM741. The gain of the system is
determined by the feedback resistor and input resistor connected to the inverting input. The gain can be
calculated by Equation 1:
Gain = 1 + (R2/R1)
(1)
The gain is set to 2 for this application. R1 and R2 are 4.7-k resistors with 5% tolerance.
8.2.2 Detailed Design Procedure
The LM741 can be operated in either single supply or dual supply. This application is configured for dual supply
with the supply rails at ±15 V. The input signal is connected to a function generator. A 1-Vpp, 10-kHz sine wave
was used as the signal input. 5% tolerance resistors were used, but if the application requires an accurate gain
response, use 1% tolerance resistors.
Copyright © 1998–2015, Texas Instruments Incorporated
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