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OPA991 Datenblatt(PDF) 24 Page - Texas Instruments

Teilenummer OPA991
Bauteilbeschribung  OPAx991 40-V Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Op Amp
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA991 Datenblatt(HTML) 24 Page - Texas Instruments

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Frequency (Hz)
40
50
60
70
80
90
100
110
1M
10M
100M
1G
C004
24
OPA991, OPA2991, OPA4991
SBOS969B – OCTOBER 2019 – REVISED MAY 2020
www.ti.com
Product Folder Links: OPA991 OPA2991 OPA4991
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Feature Description (continued)
7.3.2 EMI Rejection
The OPAx991 uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI from
sources such as wireless communications and densely-populated boards with a mix of analog signal chain and
digital components. EMI immunity can be improved with circuit design techniques; the OPAx991 benefits from
these design improvements. Texas Instruments has developed the ability to accurately measure and quantify the
immunity of an operational amplifier over a broad frequency spectrum extending from 10 MHz to 6 GHz.
Figure 44 shows the results of this testing on the OPAx991. Table 2 shows the EMIRR IN+ values for the
OPAx991 at particular frequencies commonly encountered in real-world applications. The EMI Rejection Ratio of
Operational Amplifiers application report contains detailed information on the topic of EMIRR performance as it
relates to op amps and is available for download from www.ti.com.
Figure 44. EMIRR Testing
Table 2. OPA991 EMIRR IN+ for Frequencies of Interest
FREQUENCY
APPLICATION OR ALLOCATION
EMIRR IN+
400 MHz
Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency (UHF)
applications
73.2 dB
900 MHz
Global system for mobile communications (GSM) applications, radio communication, navigation,
GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications
82.5 dB
1.8 GHz
GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 GHz)
89.7 dB
2.4 GHz
802.11b, 802.11g, 802.11n, Bluetooth®, mobile personal communications, industrial, scientific and
medical (ISM) radio band, amateur radio and satellite, S-band (2 GHz to 4 GHz)
93.9 dB
3.6 GHz
Radiolocation, aero communication and navigation, satellite, mobile, S-band
95.7 dB
5 GHz
802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite
operation, C-band (4 GHz to 8 GHz)
98.0 dB


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