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.