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INA821 Folha de dados(PDF) 20 Page - Texas Instruments |
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INA821 Folha de dados(HTML) 20 Page - Texas Instruments |
20 / 41 page : G 49.4 k G 1 R + ± + ± + ± 10 k 24.7 k 10 k 10 k 10 k 24.7 k Overvoltage Protection Overvoltage Protection RG REF +VS V- OUT V+ -VS -IN +IN : G 49.4 k G 1 R O IN IN REF V G V V V Copyright © 2017, Texas Instruments Incorporated RG RG 20 INA821 SBOS893A – AUGUST 2018 – REVISED DECEMBER 2018 www.ti.com Product Folder Links: INA821 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Setting the Gain Figure 55 shows that the gain of the INA821 is set by a single external resistor (RG) connected between the RG pins (pins 1 and 8). Figure 55. Simplified Diagram of the INA821 With Gain and Output Equations The value of RG is selected according to: (1) Table 2 lists several commonly used gains and resistor values. The 49.4-k Ω term in Equation 1 is a result of the sum of the two internal 24.7-kΩ feedback resistors. These on-chip resistors are laser-trimmed to accurate absolute values. The accuracy and temperature coefficients of these resistors are included in the gain accuracy and drift specifications of the INA821. As shown in Figure 55 and explained in more details in section Layout, it is highly recommended to connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as close to the device as possible. Table 2. Commonly-Used Gains and Resistor Values DESIRED GAIN RG (Ω) NEAREST 1% RG (Ω) 1 NC NC 2 49.4 k 49.9 k 5 12.35 k 12.4 k 10 5.489 k 5.49 k 20 2.600 k 2.61 k 50 1.008 k 1 k 100 499 499 200 248 249 500 99 100 1000 49.4 49.9 |
Nº de peça semelhante - INA821_18 |
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Descrição semelhante - INA821_18 |
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