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LSF0102DCTR датащи(PDF) 21 Page - Texas Instruments |
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LSF0102DCTR датащи(HTML) 21 Page - Texas Instruments |
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21 / 53 page ![]() Vref_A VCCB EN 200 kΩ A1 A2 B1 B2 GND LSF0108 Vref_B 3.3 V Device 3.3 V RB1 0.1 μF RA1 1.8 V Device 1.8 V VCCA Figure 9-5. Single Supply Translation with 3.3 V Supply The steps to select the resistor values for R1 and R2 are as follows: 1. Select a value for R1. Typically, 1 MΩ is used to reduce current consumption. 2. Plug in values for your system into the the following equation. Note that Vref_A is the lowest voltage in the system. VCCB is the primary supply and R1 is the selected value from step 1. R2 = 200 103 × R1 × VREFA 200 103 + R1 VCCB − VREFA − 0.85 × R1 (4) The single supply used must be at least 0.8 V larger than the lowest desired translation voltage. The voltage at Vref_A must be selected as the lowest voltage to be used in the system. The LSF evaluation module (LSF-EVM) contains unpopulated pads to place R1 and R2 for single supply operation testing. For an example single supply translation schematic and details, see the Single Supply Translation with the LSF Family video. www.ti.com LSF0108 SDLS966L – DECEMBER 2013 – REVISED DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 21 Product Folder Links: LSF0108 |
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