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LM2904BA Datasheet(PDF) 28 Page - Texas Instruments

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Part # LM2904BA
Description  Industry-Standard Dual Operational Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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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 LMx58 and LM2904 operational amplifiers are useful in a wide range of signal conditioning applications.
Inputs can be powered before VSfor flexibility in multiple supply circuits.
9.2 Typical Application
A typical application for an operational amplifier is an inverting amplifier. This amplifier takes a positive voltage
on the input, and makes it a negative voltage of the same magnitude. In the same manner, it also makes
negative voltages positive.
Vsup+
+
VOUT
RF
VIN
RI
Vsup-
Figure 9-1. Application Schematic
9.2.1 Design Requirements
The supply voltage must be chosen such that it is larger than the input voltage range and output range. For
instance, this application scales a signal of ±0.5 V to ±1.8 V. Setting the supply at ±12 V is sufficient to
accommodate this application.
9.2.2 Detailed Design Procedure
Determine the gain required by the inverting amplifier using Equation 1 and Equation 2:
V
VOUT
A
VIN
(1)
V
1.8
A
3.6
0.5
(2)
Once the desired gain is determined, choose a value for RI or RF. [Subscripts should be fixed in the
accompanying figures and equations also.] Choosing a value in the kilohm range is desirable because the
amplifier circuit uses currents in the milliampere range. This ensures the part does not draw too much current.
This example uses 10 kΩ for RI which means 36 kΩ is used for RF. This was determined by Equation 3.
V
RF
A
RI
(3)
LM158, LM158A, LM258, LM258A
LM2904, LM2904B, LM2904BA, LM2904V
LM358, LM358A, LM358B, LM358BA
SLOS068AA – JUNE 1976 – REVISED MARCH 2022
www.ti.com
28
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: LM158 LM158A LM258 LM258A LM2904 LM2904B LM2904BA LM2904V LM358
LM358A LM358B LM358BA


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