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.