OPA202ID datasheet(26/49 Pages) TI1

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Low-Pass Filter

Digital Multimeter

Ambient temperature: 25Û&

Sample /

Averaging

+VS

-VS

Not shown: 0.1 µF and 10 µF

supply decoupling

RF source

DC Bias: 0 V

Modulation: None (CW)

Frequency Sweep: 201 pt. Log

OPA202, OPA2202, OPA4202

SBOS812G – OCTOBER 2017 – REVISED MARCH 2020

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Product Folder Links: OPA202 OPA2202 OPA4202

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Table 3 lists the EMIRR IN+ values for the OPAx202 at particular frequencies commonly encountered in real-

world applications. Table 3 lists applications that 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.

Table 3. OPAx202 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

41 dB

900 MHz

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

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

47 dB

1.8 GHz

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

54 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)

67 dB

3.6 GHz

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

67 dB

5 GHz

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

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

81 dB

7.3.8 EMIRR +IN Test Configuration

Figure 45 shows the circuit configuration for testing the EMIRR IN+. An RF source is connected to the op amp

noninverting input pin using a transmission line. The op amp is configured in a unity-gain buffer topology with the

output connected to a low-pass filter (LPF) and a digital multimeter (DMM). A large impedance mismatch at the

op amp input causes a voltage reflection; however, this effect is characterized and accounted for when

determining the EMIRR IN+. The resulting DC offset voltage is sampled and measured by the multimeter. The

LPF isolates the multimeter from residual RF signals that may interfere with multimeter accuracy.

Figure 45. EMIRR +IN Test Configuration

7.4 Device Functional Modes

The OPAx202 have a single functional mode and are operational when the power-supply voltage is greater than

4.5 V (±2.25 V). The maximum power supply voltage for the OPAx202 is 36 V (±18 V).

OPA202ID Datasheet(PDF) 26 Page - Texas Instruments

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