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LM2902-EP Folha de dados(PDF) 23 Page - Texas Instruments |
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LM2902-EP Folha de dados(HTML) 23 Page - Texas Instruments |
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23 / 53 page  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, as well as validating and testing their design implementation to confirm system functionality. 9.1 Application Information The LMx24 and LM2902 operational amplifiers are useful in a wide range of signal conditioning applications. Inputs can be powered before VCC for flexibility in multiple supply circuits. 9.2 Typical Application A typical application for an operational amplifier in 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 will scale 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. Choosing a value in the kilohm range is desirable because the amplifier circuit uses currents in the milliamp range. This choice makes sure that the part does not draw too much current. This example chooses 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 LM124, LM124A, LM224, LM224A, LM224K, LM224KA LM324, LM324A, LM324B, LM324K, LM324KA LM2902, LM2902B, LM2902K, LM2902KV, LM2902KAV SLOS066Y – SEPTEMBER 1975 – REVISED OCTOBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: LM124 LM124A LM224 LM224A LM224K LM224KA LM324 LM324A LM324B LM324K LM324KA LM2902 LM2902B LM2902K LM2902KV LM2902KAV |
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