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LM124AFKB 数据表(PDF) 24 Page - Texas Instruments |
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LM124AFKB 数据表(HTML) 24 Page - Texas Instruments |
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24 / 65 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 are able to be powered before VCC for flexibility in multiple supply circuits. 9.2 Typical Application A common application for an operational amplifier is an inverting amplifier. This amplifier takes a positive voltage on the input, and produces a negative voltage with the same magnitude. In the same manner, the amplifier also makes negative voltages positive. A linear gain can be achieved by changing the resistor ratio in the feedback path. Vsup+ + VOUT RF VIN RI Vsup- Figure 9-1. Application Schematic 9.2.1 Design Requirements The supply voltage must be chosen such that the supply voltage is larger than the input voltage range and output range. For instance, this application scales a signal of ±0.5V to ±1.8V. Setting the supply at ±12V 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: AV= VOUTVIN (1) AV= 1.8−0.5 = −3.6 (2) After the desired gain is determined, choose a value for RI or RF. Choosing a value in the kΩ range is desirable because the amplifier circuit uses currents in the mA range. This choice does not draw too much current. This example chooses 10kΩ for RI, which means 36kΩ is used for RF. These values are determined by Equation 3. AV= RFRI (3) LM124, LM124A, LM224, LM224A, LM224K, LM224KA LM324, LM324A, LM324B, LM324BA, LM324K, LM324KA LM2902, LM2902B, LM2902BA, LM2902K, LM2902KAV, LM2902KV SLOS066AE – AUGUST 1975 – REVISED SEPTEMBER 2025 www.ti.com 24 Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated Product Folder Links: LM124 LM124A LM224 LM224A LM224K LM224KA LM324 LM324A LM324B LM324BA LM324K LM324KA LM2902 LM2902B LM2902BA LM2902K LM2902KAV LM2902KV |
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