JAJSMR9A November 2021 – April 2022 OPA4H014-SEP
PRODUCTION DATA
The electromagnetic interference (EMI) rejection ratio, or EMIRR, describes the EMI immunity of operational amplifiers. An adverse effect that is common to many op amps is a change in the offset voltage as a result of RF signal rectification. An op amp that is more efficient at rejecting this change in offset as a result of EMI has a higher EMIRR and is quantified by a decibel value. Measuring EMIRR can be performed in many ways, but this section provides the EMIRR IN+, which specifically describes the EMIRR performance when the RF signal is applied to the noninverting input pin of the op amp. In general, only the noninverting input is tested for EMIRR for the following three reasons:
The EMIRR IN+ of the OPA4H014-SEP is plotted versus frequency as shown in Figure 8-4. If available, any dual and quad op-amp device versions have nearly similar EMIRR IN+ performance. The OPA4H014-SEP unity-gain bandwidth is 11 MHz. EMIRR performance less than this frequency denotes interfering signals that fall within the op-amp bandwidth.
For more information, see the EMI Rejection Ratio of Operational Amplifiers application report, available for download from www.ti.com.
Table 8-1 lists the EMIRR IN+ values for the OPA4H014-SEP 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. This information may be of special interest to designers working with these types of applications, or working in other fields likely to encounter RF interference from broad sources, such as the industrial, scientific, and medical (ISM) radio band.
FREQUENCY | APPLICATION OR ALLOCATION | EMIRR IN+ |
---|---|---|
400 MHz | Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency (UHF) applications | 53.1 dB |
900 MHz | Global system for mobile communications (GSM) applications, radio communication, navigation, GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications | 72.2 dB |
1.8 GHz | GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 GHz) | 80.7 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) | 86.8 dB |
3.6 GHz | Radiolocation, aero communication and navigation, satellite, mobile, S-band | 91.7 dB |
5 GHz | 802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite operation, C-band (4 GHz to 8 GHz) | 96.6 dB |