OPA172-Q1 Datasheet, PDF (17/36 Pages) Texas Instruments – 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Automotive Grade Operational Amplifiers

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OPA172-Q1, OPA2172-Q1, OPA4172-Q1
SBOS809 – NOVEMBER 2016
8.3 Feature Description
8.3.1 EMI Rejection
The OPAx172-Q1 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 OPAx172-Q1 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 42 shows the results of this testing on the OPAx172-Q1. Table 3 shows the EMIRR IN+ values for
the OPAx172-Q1 at particular frequencies commonly encountered in real-world applications. Applications listed in
Table 3 can be centered on or operated near the particular frequency shown. Detailed information can also be
found in the EMI Rejection Ratio of Operational Amplifiers application report (SBOA128), available for download
from www.ti.com.
160.0
140.0
120.0
P_RF = -10 dBm
V_SUPPLY = ±18 V
V_CM = 0 V
100.0
80.0
60.0
40.0
20.0
0.0
10M
100M
1G
Frequency (Hz)
10G
C017
Figure 42. EMIRR Testing
FREQUENCY
400 MHz
900 MHz
1.8 GHz
2.4 GHz
3.6 GHz
5 GHz
Table 3. OPAx172-Q1 EMIRR IN+ for Frequencies of Interest
APPLICATION OR ALLOCATION
Mobile radio, mobile satellite, space operation, weather, radar, ultrahigh 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+
47.6 dB
58.5 dB
68 dB
69.2 dB
82.9 dB
114 dB
Copyright © 2016, Texas Instruments Incorporated
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