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LM2904-Q1 Datasheet(PDF) 21 Page - Texas Instruments

Part # LM2904-Q1
Description  LM2904-Q1, LM2904B-Q1, and LM2904BA-Q1 Industry-Standard Dual Operational Amplifiers for Automotive Applications
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2904-Q1 Datasheet(HTML) 21 Page - Texas Instruments

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10 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.
10.1 Application Information
The LM2904-Q1, LM2904B-Q1, LM2904BA-Q1 operational amplifiers are useful in a wide range of signal
conditioning applications. Inputs can be powered before VS for flexibility in multiple supply circuits. For full
application design guidelines related to this family of devices, please refer to the application report Application
design guidelines for LM324/LM358 devices.
10.2 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 10-1. Application Schematic
10.2.1 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.
10.2.2 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. 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)
www.ti.com
LM2904-Q1, LM2904B-Q1, LM2904BA-Q1
SLOS414K – MAY 2003 – REVISED APRIL 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: LM2904-Q1 LM2904B-Q1 LM2904BA-Q1


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