Input Stage Offset Voltage Drift (PV/qC)

0

2.5%

5%

7.5%

10%

12.5%

15%

17.5%

20%

22.5%

25%

-0.4

0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

D002

+

±

+

±

+

±

40 k

25 k

40 k

40 k

40 k

25 k

Over-

Voltage

Protection

Over-

Voltage

Protection

RG

REF

+VS

OUT

-VS

-IN

+IN

RG

O

IN

IN

REF

V

G V

V

V

:

G

50 k

G

1

R

RG

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Folder

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Now

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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.

INA818

SBOS894A – APRIL 2019 – REVISED JUNE 2019

INA818 35-μV Offset, 8-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier

1

1 Features

1

•

Low offset voltage: 10 µV (typ), 35 µV (max)

•

Gain drift: 5 ppm/°C (G = 1),

35 ppm/°C (G > 1) (max)

•

Noise: 8 nV/

√Hz

•

Bandwidth: 2 MHz (G = 1), 270 kHz (G = 100)

•

Stable with 1-nF capacitive loads

•

Inputs protected up to ±60 V

•

Common-mode rejection: 110 dB, G = 10 (min)

•

Power-supply rejection: 100 dB, G = 1 (min)

•

Supply current: 385 µA (max)

•

Supply voltage range:

–

Single supply: 4.5 V to 36 V

–

Dual supply: ±2.25 V to ±18 V

•

Specified temperature: –40°C to +125°C

•

Package: 8-pin SOIC

2 Applications

•

Industrial monitors

•

Flow transmitters

•

Battery test equipment

•

Multiparameter patient monitors

•

Analog input modules

•

Semiconductor test equipment

•

Portable instrumentation

3 Description

The INA818 is a high-precision instrumentation

amplifier that offers low power consumption and

operates over a very wide single-supply or dual-

supply range. A single external resistor sets any gain

from 1 to 10000. The device offers high precision as

a result of super-beta input transistors, which provide

exceptionally low input offset voltage, offset voltage

drift, input bias current, input voltage, and current

noise. Additional circuitry protects the inputs against

overvoltage up to ±60 V.

The INA818 is optimized to provide a high common-

mode rejection ratio. At G = 1, the common-mode

rejection ratio exceeds 90 dB across the full input

common-mode range. The device is designed for low-

voltage operation from a 4.5-V single supply, as well

as dual supplies up to ±18 V.

The INA818 is available in an 8-pin SOIC package

and

is

specified

over

the

–40°C

to

+125°C

temperature range.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA818

SOIC (8)

4.90 mm × 3.91 mm

(1) For all available packages, see the package option addendum

at the end of the data sheet.

INA818 Simplified Internal Schematic

Typical Distribution of Input Stage Offset Voltage

Drift