0.1

10

1

100

1k

10k

100k

10k

1k

100

10

1

Frequency (Hz)

INPUT VOLTAGE AND CURRENT NOISE

SPECTRAL DENSITY vs FREQUENCY

Current Noise

Voltage Noise

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

OPA227, OPA2227, OPA4227

OPA228, OPA2228, OPA4228

SBOS110B – MAY 1998 – REVISED JUNE 2015

OPAx22x High Precision, Low Noise Operational Amplifiers

1 Features

3 Description

The OPAx22x series operational amplifiers combine

1

•

Low Noise: 3nV/

√Hz

low noise and wide bandwidth with high precision to

•

Wide Bandwidth:

make them the ideal choice for applications requiring

–

OPA227: 8 MHz, 2.3 V/

μs

both AC and precision DC performance.

–

OPA228: 33 MHz, 10 V/

μs

The OPAx227 is unity-gain stable and features high

•

Settling Time: 5

μs

slew rate (2.3V/µs) and wide bandwidth (8MHz). The

OPAx228 is optimized for closed-loop gains of 5 or

(Significant Improvement Over OP-27)

greater, and offers higher speed with a slew rate of

•

High CMRR: 138 dB

10V/µs and a bandwidth of 33MHz.

•

High Open-loop Gain: 160 dB

The OPAx227 and OPAx228 series operational

•

Low Input Bias Current: 10 nA Maximum

amplifiers are ideal for professional audio equipment.

•

Low Offset Voltage: 75 µV Maximum

In addition, low quiescent current and low cost make

them ideal for portable applications requiring high

•

Wide Supply Range: ±2.5 V to ±18 V

precision.

•

OPA227 Replaces OP-27, LT1007, MAX427

The OPAx227 and OPAx228 series operational

•

OPA228 Replaces OP-37, LT1037, MAX437

amplifiers

are

pin-for-pin

replacements

for

the

•

Single, Dual, and Quad Versions

industry standard OP-27 and OP-37 with substantial

improvements across the board. The dual and quad

2 Applications

versions are available for space savings and per

channel cost reduction.

•

Data Acquisition

•

Telecom Equipment

The OPAx227, OPAx228, are available in DIP-8 and

SO-8 packages. The OPA4227 and OPA4228 are

•

Geophysical Analysis

available in DIP-14 and SO-14 packages with

•

Vibration Analysis

standard pin configurations. Operation is specified

•

Spectral Analysis

from –40°C to 85°C.

•

Professional Audio Equipment

Device Information(1)

•

Active Filters

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Power Supply Controls

PDIP (8)

9.81 mm × 6.35 mm

OPA227

OPA228

Input Referred Noise

SOIC (8)

4.90 mm × 3.91 mm

PDIP (8)

9.81 mm × 6.35 mm

OPA2227

OPA2228

SOIC (8)

4.90 mm × 3.91 mm

PDIP (14)

19.30 mm × 6.35 mm

OPA4227

OPA4228

SOIC (14)

8.65 mm × 3.91 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.