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INA821 Arkusz danych(PDF) 22 Page - Texas Instruments

Numer części INA821
Szczegółowy opis  35-關V Offset, 7-nV/?숰z Noise, Low-Power, Precision Instrumentation Amplifier
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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INA821 Arkusz danych(HTML) 22 Page - Texas Instruments

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Frequency (Hz)
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100M
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Frequency (Hz)
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100M
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10G
EMIRR (dB)
2
RF _ PEAK
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OS
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V
V
10
100 mV
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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


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