50kW

150kW

150kW

A

1

A

3

V

OUT

V

IN-

6

REF

5

RFIFilteredInputs

2

V+

7

V-

4

1

8

150kW

150kW

50kW

A

2

V

IN+

RFIFilteredInputs

3

INA333

R

G

G=1+

100kW

R

G

RFIFilteredInputs

RFIFilteredInputs

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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.

INA333

SBOS445C – JULY 2008 – REVISED DECEMBER 2015

INA333 Micro-Power (50

μA), Zerø-Drift, Rail-to-Rail Out Instrumentation Amplifier

1

1 Features

1

•

Low Offset Voltage: 25

μV (Maximum), G ≥ 100

•

Low Drift: 0.1

μV/°C, G ≥ 100

•

Low Noise: 50 nV/

√Hz, G ≥ 100

•

High CMRR: 100 dB (Minimum), G

≥ 10

•

Low Input Bias Current: 200 pA (Maximum)

•

Supply Range: 1.8 V to 5.5 V

•

Input Voltage: (V–) +0.1 V to (V+) –0.1 V

•

Output Range: (V–) +0.05 V to (V+) –0.05 V

•

Low Quiescent Current: 50

μA

•

Operating Temperature: –40°C to +125°C

•

RFI Filtered Inputs

•

8-Pin VSSOP and 8-Pin WSON Packages

2 Applications

•

Bridge Amplifiers

•

ECG Amplifiers

•

Pressure Sensors

•

Medical Instrumentation

•

Portable Instrumentation

•

Weigh Scales

•

Thermocouple Amplifiers

•

RTD Sensor Amplifiers

•

Data Acquisition

3 Description

The

INA333

device

is

a

low-power,

precision

instrumentation amplifier offering excellent accuracy.

The versatile 3-operational amplifier design, small

size, and low power make it ideal for a wide range of

portable applications.

A single external resistor sets any gain from 1 to

1000. The INA333 is designed to use an industry-

standard gain equation: G = 1 + (100 k

Ω / RG).

The INA333 device provides very low offset voltage

(25

μV, G ≥ 100), excellent offset voltage drift

(0.1

μV/°C, G ≥ 100), and high common-mode

rejection (100 dB at G

≥ 10). It operates with power

supplies as low as 1.8 V (±0.9 V) and quiescent

current is only 50

μA, making it ideal for battery-

operated systems. Using autocalibration techniques

to ensure excellent precision over the extended

industrial temperature range, the INA333 device also

offers exceptionally low noise density (50 nV/

√Hz)

that extends down to DC.

The INA333 device is available in both 8-pin VSSOP

and WSON surface-mount packages and is specified

over the TA = –40°C to +125°C temperature range.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA333

VSSOP (8)

3.00 mm × 3.00 mm

WSON (8)

3.00 mm × 3.00 mm

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

the end of the data sheet.

Simplified Schematic