OPA197 Datasheet, PDF (21/41 Pages) Texas Instruments – Operational Amplifiers

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OPA197, OPA2197, OPA4197
SBOS737 – JANUARY 2016
Feature Description (continued)
The OPAx197 family of operational amplifiers provides a true high-impedance differential input capability for high-
voltage applications. This patented input protection architecture does not introduce additional signal distortion or
delayed settling time, making the device an optimal op amp for multichannel, high-switched, input applications.
The OPA197 can tolerate a maximum differential swing (voltage between inverting and noninverting pins of the
op amp) of up to 36 V, making the device suitable for use as a comparator or in applications with fast-ramping
input signals such as multiplexed data-acquisition systems, as shown in Figure 53.
7.3.2 EMI Rejection
The OPAx197 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 OPAx197 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 OPA197. Table 2 shows the EMIRR IN+ values for the OPA197
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.
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 44. EMIRR Testing
FREQUENCY
400 MHz
900 MHz
1.8 GHz
2.4 GHz
3.6 GHz
5.0 GHz
Table 2. OPA197 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+
44.1 dB
52.8 dB
61.0 dB
69.5 dB
88.7 dB
105.5 dB
Copyright © 2016, Texas Instruments Incorporated
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