1 Features
• Low noise: 3 nV/√Hz
• Wide bandwidth:
– OPA227: 8 MHz, 2.3 V/μs
– OPA228: 33 MHz, 10 V/μs
• Settling time: 5 μs
• High CMRR: 138 dB
• High open-loop gain: 160 dB
• Low input bias current: 10 nA maximum
• Low offset voltage: 75 μV maximum
• Wide supply range: ±2.5 V to ±18 V
• Single, dual, and quad versions

2 Applications
• Data acquisition (DAQ)
• Condition monitoring sensor
• Spectrum analyzer
• Professional audio amplifier (rack mount)
• Industrial AC-DC

3 Description
The OPAx227 and OPAx228 series operational
amplifiers combine low noise and wide bandwidth
with high precision to make them an excellent choice
for applications requiring both ac and precision dc
performance.
The OPAx227 are unity-gain stable and features high
slew rate (2.3 V/μs) and wide bandwidth (8 MHz). The
OPAx228 are optimized for closed-loop gains of 5 or
greater, and offers higher speed with a slew rate of 10
V/μs and a bandwidth of 33 MHz.
The OPAx227 and OPAx228 series operational
amplifiers are an excellent choice for professional
audio equipment. In addition, low quiescent current
and low cost make these op amps an excellent choice
for portable applications requiring high precision.
The OPAx227 and OPAx228 series operational
amplifiers are pin-for-pin replacements for the
industry-standard OP27 and OP37 with substantial
improvements across the board. The dual and quad
versions are available for space savings and perchannel
cost reduction.
The OPAx227 and OPAx228, are available in DIP-8
and SO-8 packages. The OPA4227 and OPA4228
are available in DIP-14 and SO-14 packages with
standard pin configurations. Operation is specified
from –40°C to +85°C.