OPA2191 datasheet(24/59 Pages) TI

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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

8-3 shows the results of this testing on the OPAx191. Table 8-1 shows the EMIRR IN+ values for the OPAx191 at

particular frequencies commonly encountered in real-world applications. Applications listed in Table 8-1 may 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 , available for download from www.ti.com.

Frequency (MHz)

100

120

100

10k

PRF = –10 dBm, VS = ±15 V, VCM = 0 V

Figure 8-3. EMIRR Testing

Table 8-1. OPA191 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

36 dB

900 MHz

Global system for mobile communications (GSM) applications, radio communication, navigation,

GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications

45 dB

1.8 GHz

GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 GHz)

57 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)

62 dB

3.6 GHz

Radiolocation, aero communication and navigation, satellite, mobile, S-band

76 dB

5.0 GHz

802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite

operation, C-band (4 GHz to 8 GHz)

86 dB

OPA191, OPA2191, OPA4191

SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021

www.ti.com

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