A

1

A

2

A

3

40kΩ

40kΩ

40kΩ

40kΩ

V

IN

2

1

8

3

6

5

V

IN

R

G

V+

Ref

V

O

G = 1 +

49.4kΩ

R

G

−

+

4

7

NOTE: (1) INA129: 24.7kΩ

G = 1 +

50kΩ

R

G

INA128, INA129

Over-Voltage

Protection

Over-Voltage

Protection

25k

Ω

(1)

25kΩ(1)

INA128:

INA129:

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

INA128, INA129

SBOS051C – OCTOBER 1995 – REVISED OCTOBER 2015

INA12x Precision, Low Power Instrumentation Amplifiers

1 Features

3 Description

The INA128 and INA129 are low-power, general

1

•

Low Offset Voltage: 50

μV Maximum

purpose instrumentation amplifiers offering excellent

•

Low Drift: 0.5

μV/°C Maximum

accuracy. The versatile 3-op amp design and small

•

Low Input Bias Current: 5 nA Maximum

size make these amplifiers ideal for a wide range of

applications. Current-feedback input circuitry provides

•

High CMR: 120 dB minimum

wide bandwidth even at high gain (200 kHz at G =

•

Inputs Protected to ±40 V

100).

•

Wide Supply Range: ±2.25 V to ±18 V

A single external resistor sets any gain from 1 to

•

Low Quiescent Current: 700

μA

10,000. The INA128 provides an industry-standard

•

8-PIN Plastic Dip, SO-8

gain

equation;

the

INA129

gain

equation

is

compatible with the AD620.

2 Applications

The INA12x is laser-trimmed for very low offset

•

Bridge Amplifier

voltage (50

μV), drift (0.5 μV/°C) and high common-

mode rejection (120 dB at G

≥ 100). The INA12x

•

Thermocouple Amplifier

operates with power supplies as low as ±2.25 V, and

•

RTD Sensor Amplifier

quiescent current is only 700

μA, ideal for battery-

•

Medical Instrumentation

operated systems. Internal input protection can

withstand up to ±40 V without damage.

•

Data Acquisition

The INA12x is available in 8-pin plastic DIP and SO-8

surface-mount packages, specified for the –40°C to

85°C

temperature

range.

The

INA128

is

also

available in a dual configuration, the INA2128.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SOIC (8)

3.91 mm × 4.9 mm

INA128

INA129

PDIP (8)

6.35 mm × 9.81 mm

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

the end of the data sheet.

Simplified Schematic

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.