1 Features
• Ultra-high precision:
– Zero-drift: 0.005 μV/°C (OPA189)
– Ultra-low offset voltage: 3 μV maximum
(OPA189)
• Excellent dc precision:
– CMRR: 168 dB
– Open-loop gain: 170 dB
• Low noise:
– en at 1 kHz: 5.2 nV/√Hz
– 0.1-Hz to 10-Hz noise: 0.1 μVPP
• Excellent dynamic performance:
– Gain bandwidth: 14 MHz
– Slew rate: 20 V/μs
– Fast settling: 10-V step, 0.01% in 1.1 μs
• Robust design:
– MUX-friendly inputs
– RFI/EMI filtered inputs
• Wide supply range: 4.5 V to 36 V
• Quiescent current: 1.7 mA (maximum)
• Rail-to-rail output
• Input includes negative rail

2 Applications
• Battery test
• Analog input module
• Weigh scale
• DC power supply, ac source, electronic load
• Multifunction relay

3 Description
The OPA189, OPA2189, and OPA4189 (OPAx189)
high-precision operational amplifiers are ultra-low
noise, fast-settling, zero-drift devices that provide railto-
rail output operation and feature a unique MUXfriendly
architecture and controlled start-up system.
These features and excellent ac performance,
combined with only 0.4 μV of offset voltage and
0.005μV/°C of drift over temperature for the singlechannel
version, make the OPAx189 a great choice
for precision instrumentation, signal measurement,
and active filtering applications. Moreover, the MUXfriendly
input architecture prevents inrush current
when applying large input differential voltages,
which improves settling performance in multichannel
systems, all while providing robust ESD protection
during shipment, handling, and assembly.
All versions are specified from –40°C to +125°C.