Datasheet

160
140
120
100
80
60
40
20
0
EMIRRIN+(dB)
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
with high CMRR, PSRR, and A
OL
. As with all amplifiers, applications with noisy or high-impedance power
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)
802.11b, 802.11g, 802.11n, Bluetooth
®
, mobile personal communications,
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)
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