160

140

120

100

80

60

40

20

0

10M

10G

Frequency(Hz)

100M

1G

OPA188

SBOS642A – MARCH 2013 – REVISED MARCH 2013

www.ti.com

APPLICATION INFORMATION

The OPA188 operational amplifier combines precision offset and drift with excellent overall performance, making

the device ideal for many precision applications. The precision offset drift of only 0.085 µV per degree Celsius

provides stability over the entire temperature range. In addition, the device offers excellent overall performance

supplies require decoupling capacitors close to the device pins. In most cases, 0.1-µF capacitors are adequate.

OPERATING CHARACTERISTICS

The OPA188 is specified for operation from 4 V to 36 V (±2 V to ±18 V). Many specifications apply from –40°C to

+125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are

presented in the Typical Characteristics section.

EMI REJECTION

The OPA188 uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI interference

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 OPA188 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 39 shows the results of this testing on the OPA188. Table 3 shows the EMIRR IN+ values for the OPA188

at particular frequencies commonly encountered in real-world applications. Applications listed in Table 3 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.

Figure 39. EMIRR Testing

Table 3. OPA188 EMIRR IN+ for Frequencies of Interest

FREQUENCY

APPLICATION/ALLOCATION

EMIRR IN+

Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency

400 MHz

62.2 dB

(UHF) applications

Global system for mobile communications (GSM) applications, radio

900 MHz

communication, navigation, GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF

74.7 dB

applications

GSM applications, mobile personal communications, broadband, satellite, L-band

1.8 GHz

100.7 dB

(1 GHz to 2 GHz)

2.4 GHz

industrial, scientific and medical (ISM) radio band, amateur radio and satellite, S-

102.4 dB

band (2 GHz to 4 GHz)

3.6 GHz

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

104.8 dB

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

5.0 GHz

100.3 dB

space and satellite operation, C-band (4 GHz to 8 GHz)

16

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