OPA191_017 Datasheet, PDF (24/51 Pages) Texas Instruments – 36-V, Low Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

OPA191, OPA2191, OPA4191
SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016
www.ti.com
Feature Description (continued)
8.3.2 EMI Rejection
The OPAx191 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 OPAx191 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 53 shows the results of this testing on the OPAx191. Table 2 shows the EMIRR IN+ values for the
OPAx191 at particular frequencies commonly encountered in real-world applications. Applications listed in
Table 2 may be centered on or operated near the particular frequency shown. Detailed information can also be
found in the application report EMI Rejection Ratio of Operational Amplifiers, SBOA128, available for download
from www.ti.com.
120
100
80
60
40
20
0
10
100
1k
10k
Frequency (MHz)
P_RF = –10 dBm, V_S = ±15 V, V_CM = 0 V
Figure 53. EMIRR Testing
FREQUENCY
400 MHz
900 MHz
1.8 GHz
2.4 GHz
3.6 GHz
5.0 GHz
Table 2. OPA191 EMIRR IN+ For Frequencies of Interest
APPLICATION OR ALLOCATION
Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency (UHF)
applications
Global system for mobile communications (GSM) applications, radio communication, navigation,
GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications
GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 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)
Radiolocation, aero communication and navigation, satellite, mobile, S-band
802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite
operation, C-band (4 GHz to 8 GHz)
EMIRR IN+
36 dB
45 dB
57 dB
62 dB
76 dB
86 dB
24
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