OPA1688 Datasheet, PDF (19/41 Pages) Texas Instruments – OPA168x SoundPlus 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Operational Amplifiers

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OPA1688, OPA1689
SBOS724 – SEPTEMBER 2015
9.3 Feature Description
9.3.1 EMI Rejection
The OPA168x 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 OPA168x 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 OPA168x. Table 2 shows the EMIRR IN+ values for the
OPA168x at particular frequencies commonly encountered in real-world applications. Applications listed in
Table 2 can be centered on or operated near the particular frequency shown. Detailed information can also be
found in application report SBOA128, EMI Rejection Ratio of Operational Amplifiers, available for download from
www.ti.com.
160
140
120
100
80
60
40
20
0
10M
100M
1G
Frequency (Hz)
10G
C017
P_RF = –10 dBm, V_SUPPLY = ±18 V, V_CM = 0 V
Figure 44. EMIRR Testing
FREQUENCY
400 MHz
900 MHz
1.8 GHz
2.4 GHz
3.6 GHz
5.0 GHz
Table 2. OPAx168x EMIRR IN+ for Frequencies of Interest
APPLICATION OR ALLOCATION
Mobile radio, mobile satellite, space operation, weather, radar, and ultrahigh
frequency (UHF) applications
Global system for mobile communications (GSM) applications, radio
communication, navigation, GPS (to 1.6 GHz), GSM, aeronautical mobile, and
UHF applications
GSM applications, mobile personal communications, broadband, satellite, and 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, and
S-band (2 GHz to 4 GHz)
Radiolocation, aero communication and navigation, satellite, mobile, and S-band
802.11a, 802.11n, aero communication and navigation, mobile communication,
space and satellite operation, and 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 © 2015, Texas Instruments Incorporated
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