(ACTIVE) 14MHz, MUX-Friendly, Low-noise, Zero-Drift, RRO, CMOS Precision Operational Amplifier


Functional Diagram


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


  • Ultra-High Precision:
    • Zero-Drift: 0.005 µV/°C
    • Ultra-Low Offset Voltage: 3 µV (Maximum)
  • 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

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Number of Channels (#) 1    
Total Supply Voltage (Min) (+5V=5, +/-5V=10) 4.5    
Total Supply Voltage (Max) (+5V=5, +/-5V=10) 36    
GBW (Typ) (MHz) 14    
Slew Rate (Typ) (V/us) 20    
Rail-to-Rail In to V-^Out    
Vos (Offset Voltage @ 25C) (Max) (mV) 0.003    
Offset Drift (Typ) (uV/C) 0.005    
Iq per channel (Typ) (mA) 1.3    
Vn at 1kHz (Typ) (nV/rtHz) 5.2    
CMRR (Typ) (dB) 168    
Rating Catalog    
Operating Temperature Range (C) -40 to 125    
Package Group SOIC    
Package Size: mm2:W x L (PKG) 8SOIC: 29 mm2: 6 x 4.9(SOIC)    
Input Bias Current (Max) (pA) 300    
Output Current (Typ) (mA) 65    
Features EMI Hardened^High Cload Drive^Zero Drift    
Architecture CMOS    

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Application notes (8)

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