1 Features
• Wide supply voltage range: 8V to 85V
• Low offset voltage: 100μV, max
• Low offset drift: 2μV/°C, max
• High CMRR: 130dB, min
• High PSRR: 120dB, min
• Low input bias current: 15pA, max
• Low noise: 12.9nV/√Hz at 1kHz
• Wide bandwidth: 3.75MHz at 40dB
• High slew rate: 100V/μs
• Low quiescent current: 420μA
• Rail-to-rail output
• Unity gain stable
• Mux-friendly inputs
• Thermal shutdown protection
• Small package options:
– Single: SOT23
– Dual: VSSOP, SOIC

2 Applications
• Semiconductor test
• CT & PET scanner
• Programmable DC power supply
• Source measurement unit (SMU)
• Analytical lab instrumentation
• Power analyzer
• Optical module

3 Description
The OPAx591 is a family of high precision, 85V
CMOS power amplifiers available in small, industry
standard packages.
These devices are laser trimmed to provide excellent
dc performance, including 100μV max offset, 2μV/°C
max offset drift. The high power supply and commonmode
rejection help these op amps maintain high
dc performance across different operating conditions.
Degradation of precision is minimal because of the
very low input bias current across the entire operating
voltage range.
The OPAx591 also excels in ac performance despite
the low quiescent current consumption. Proprietary
design techniques provide 100V/μs slew rate and
MUX-friendly inputs to enable fast settling of large
signals. The low broadband noise help maintain signal
fidelity across a wide frequency spectrum.
The combination of high precision, low noise, low
power, and small packages make the OPAx591 a
great choice for high voltage, space constrained
systems where power consumption and, or thermal
management is critical. Such systems include
automated test equipment requiring high voltage
and precision, power supplies requiring current or
voltage sensing, and piezo actuator driving for haptic
feedback systems.
This family of amplifiers operates over the extended
industrial temperature range of –40°C to +125°C.