OPA188 Datasheet, PDF (16/23 Pages) Texas Instruments – 0.03-uV/C Drift, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift OPERATIONAL AMPLIFIERS

OPA188
OPA2188
OPA4188
SBOS525 – AUGUST 2011
APPLICATION INFORMATION
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The OPAx188 family of operational amplifiers combine precision offset and drift with excellent overall
performance, making them ideal for many precision applications. The precision offset drift of only 0.085 µV/°C
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 OPAx188 family of amplifiers is specified for operation from 4 V to 36 V (±2 V to ±18 V). Many of the
specifications apply from –40°C to +105°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are presented in the Typical Characteristics.
EMI REJECTION
The OPAx188 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 OPAx188
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 OPAx188. Detailed information can also be found in the
Application Report EMI Rejection Ratio of Operational Amplifiers (SBOA128), available for download from the TI
website.
160
140
120
100
80
60
40
20
0
10M
100M
1G
10G
Frequency (Hz)
Figure 39. OPAx188 EMIRR Testing
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