INA122 Single Supply, Micropower Instrumentation Amplifier

1 Features

• Low quiescent current: 60μA

• Wide power supply range: 2.2V to 36V

• Rail-to-rail output swing

• Low offset voltage: 250μV maximum

• Low offset drift: 3μV/°C maximum

• Low noise: 60nV/√Hz

• Low input bias current: 25nA maximum

• Packages

– 4.9mm × 6mm SOIC

– 9.81mm × 9.43mm PDIP

2 Applications

• Portable electronics

• Field transmitters and sensors

• Pressure transmitters

• Infusion pumps

• Electrocardiograms (ECGs)

3 Description

The

INA122

is

a

precision

instrumentation

amplifier for accurate, low-noise differential signal

acquisition.

The

two-op-amp

design

provides

excellent performance with very low quiescent current

(60μA), and is designed for portable instrumentation

and data acquisition systems. The INA122 can be

operated with single or dual power supplies from 2.2V

to 36V.

A single external resistor sets gain from 5V/V to

10000V/V. Laser trimming provides very low offset

voltage (250μV maximum), offset voltage drift (3μV/°C

maximum) and excellent common-mode rejection.

Package options include 8-pin plastic DIP and

SOIC surface-mount packages. Both packages are

specified for the −40°C to +85°C temperature range.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

INA122

P (PDIP, 8)

9.81mm × 9.43mm

D (SOIC, 8)

4.9mm × 6mm

(1)

For all available packages, see Section 10.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

-

+

A1

-

+

A2

100k

25k

25k

100k

RG

2

1

8

3

7

6

5

4

VS

IN

+IN

+VS

REF

OUT

VOUT = (V+IN

V IN)×G

G = 5 +

200k

Ω

RG

INA122

INA122 Basic Connections

INA122

SBOS069A – OCTOBER 1997 – REVISED DECEMBER 2024

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.