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INA821 Arkusz danych(PDF) 22 Page - Texas Instruments |
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INA821 Arkusz danych(HTML) 22 Page - Texas Instruments |
22 / 41 page Frequency (Hz) 0 20 40 60 80 100 120 140 10M 100M 1G 10G Frequency (Hz) 0 20 40 60 80 100 120 10M 100M 1G 10G EMIRR (dB) 2 RF _ PEAK 20 OS P V V 10 100 mV § · ¨ ¸ © ¹ § · ¨ ¸ ' ˜ ¨ ¸ © ¹ 22 INA821 SBOS893A – AUGUST 2018 – REVISED DECEMBER 2018 www.ti.com Product Folder Links: INA821 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 8.3.2 EMI Rejection Texas Instruments developed a method to accurately measure the immunity of an amplifier over a broad frequency spectrum extending from 10 MHz to 6 GHz. This method uses an EMI rejection ratio (EMIRR) to quantify the ability of the INA821 to reject EMI. The offset resulting from an input EMI signal is calculated using Equation 2: where • VRF_PEAK is the peak amplitude of the input EMI signal. (2) Figure 56 and Figure 57 show the INA821 EMIRR graph for differential and common-mode EMI rejection across this frequency range. Table 3 shows the EMIRR values for the INA821 at frequencies encountered in real-world applications. Applications listed in Table 3 are centered on or operated near the particular frequency shown. Depending on the end-system requirements, additional EMI filters may be required near the signal inputs of the system, as well as incorporating known good practices such as using short traces, low-pass filters, and damping resistors combined with parallel and shielded signal routing. Figure 56. Common-Mode EMIRR Testing Figure 57. Differential Mode EMIRR Testing |
Podobny numer części - INA821_18 |
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Podobny opis - INA821_18 |
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