+

A2

+

A3

RFI Filter Inputs

RFI Filtered Inputs

RFI Filtered Inputs

RFI Filtered Inputs

RG

VIN-

VIN+

V-

V+

VOUT

REF

25 k

25 k

20 k

20 k

20 k

20 k

G

50 k

G 1

R

:

OUT

IN

IN

REF

V

V

V

G V

u

+

A1

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Folder

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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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.

INA188

SBOS632 – SEPTEMBER 2015

INA188

Precision, Zero-Drift, Rail-to-Rail Out, High-Voltage Instrumentation Amplifier

1

1 Features

1

•

Excellent DC Performance:

–

Low Input Offset Voltage: 55

μV (max)

–

Low Input Offset Drift: 0.2

μV/°C (max)

–

High CMRR: 104 dB, G

≥ 10 (min)

•

Low Input Noise:

–

12 nV/

√Hz at 1 kHz

–

0.25

μVPP (0.1 Hz to 10 Hz)

•

Wide Supply Range:

–

Single Supply: 4 V to 36 V

–

Dual Supply: ±2 V to ±18 V

•

Gain Set with a Single External Resistor:

–

Gain Equation: G = 1 + (50 k

Ω / RG)

–

Gain Error: 0.007%, G = 1

–

Gain Drift: 5 ppm/°C (max) G = 1

•

Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V

•

RFI-Filtered Inputs

•

Rail-to-Rail Output

•

Low Quiescent Current: 1.4 mA

•

Operating Temperature: –55°C to +150°C

•

SOIC-8 and DFN-8 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 INA188 is a precision instrumentation amplifier

that uses TI proprietary auto-zeroing techniques to

achieve low offset voltage, near-zero offset and gain

drift, excellent linearity, and exceptionally low-noise

density (12 nV/

√Hz) that extends down to dc.

The

INA188

is

optimized

to

provide

excellent

common-mode rejection of greater than 104 dB (G

≥

10). Superior common-mode and supply rejection

supports

high-resolution,

precise

measurement

applications. The versatile three op-amp design offers

a rail-to-rail output, low-voltage operation from a 4-V

single supply as well as dual supplies up to ±18 V,

and a wide, high-impedance input range. These

specifications make this device ideal for universal

signal measurement and sensor conditioning (such

as temperature or bridge applications).

A single external resistor sets any gain from 1 to

1000. The INA188 is designed to use an industry-

standard gain equation: G = 1 + (50 k

Ω / RG). The

reference pin can be used for level-shifting in single-

supply operation or for an offset calibration.

The INA188 is specified over the temperature range

of –40°C to +125°C .

Device Information

ORDER NUMBER

PACKAGE

BODY SIZE

INA188

SOIC (8)

4.90 mm × 3.91 mm

INA188

WSON (8)(2)

4.00 mm × 4.00 mm

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

the end of the data sheet.

(2) The DRJ package (WSON-8) is a preview device.

Simplified Schematic