INAx126 MicroPower Instrumentation Amplifiers

1 Features

• Low quiescent current: 175 μA/channel

• Wide supply range: ±1.35 V to ±18 V

• Low offset voltage: 250-μV maximum

• Low offset drift: 3-μV/°C maximum

• Low noise: 35 nV/√Hz

• Low input bias current: 25-nA maximum

• Temperature range: –40°C to +85°C

• Multiple package options:

– Single channel:

• INA126P/PA 8-pin PDIP (P)

• INA126U/UA 8-pin SOIC (D)

• INA126E/EA 8-pin VSSOP (DGK)

– Dual channels:

• INA2126P/PA 16-pin PDIP (N)

• INA2126U/UA 16-pin SOIC (D)

• INA2126E/EA 16-pin SSOP (DBQ)

2 Applications

• Level transmitter

• Flow transmitter

• Multiparameter patient monitor

• Mixed module (AI, AO, DI, DO)

• AC charging (pile) station

• Infusion pump

• Electrocardiogram (ECG)

3 Description

The INA126 and INA2126 (INAx126) are precision

instrumentation amplifiers for accurate, low-noise,

differential-signal acquisition. The two-op-amp design

provides excellent performance with low quiescent

current (175 μA/channel). These features combined

with a wide operating voltage range of ±1.35 V to

±18 V make the INAx126 a great choice for portable

instrumentation and data acquisition systems.

Gain can be set from 5 V/V to 10000 V/V with

a single external resistor. Precision input circuitry

provides low offset voltage (250 μV, maximum), low

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

common-mode rejection.

All versions are specified for the –40°C to +85°C

industrial temperature range.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA126

PDIP (8)

6.35 mm × 9.81 mm

SOIC (8)

3.91 mm × 4.90 mm

VSSOP (8)

3.00 mm × 3.00 mm

INA2126

PDIP (16)

6.35 mm × 19.30 mm

SOIC (16)

3.91 mm × 9.90 mm

SSOP (16)

3.90 mm × 4.90 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

40kΩ

10kΩ

10kΩ

40kΩ

INA126

5

4

2

1

8

3

7

6

R

G

V

IN

–

V

IN

+

V+

V–

V

O = (VIN – VIN) G

–

+

80kΩ

R

G

G = 5 +

Simplified Schematic: INA126

40kΩ

10kΩ

10kΩ

40kΩ

INA2126

5

7

8

1

4

3

2

9

6

RG

VIN

–

VIN

+

V+

V–

VO = (VIN – VIN) G

–

+

G = 5 +

VO = (VIN – VIN) G

–

+

G = 5 +

40kΩ

10kΩ

10kΩ

40kΩ

12

16

13

14

15

11

10

RG

VIN

–

VIN

+

80kΩ

R

G

80kΩ

R

G

Simplified Schematic: INA2126

INA126, INA2126

SBOS062C – SEPTEMBER 2000 – REVISED JANUARY 2022

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.