FEATURES

APPLICATIONS

DESCRIPTION

The INA128 and INA129 are low power, general

purpose instrumentation amplifiers offering excellent

accuracy. The versatile 3-op amp design and small size

make them ideal for a wide range of applications.

Current-feedback

input

circuitry

provides

wide

bandwidth even at high gain (200kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000.

The INA128 provides an industry-standard gain

equation; the INA129 gain equation is compatible with

the AD620.

The INA128/INA129 is laser trimmed for very low offset

voltage

(50

µV),

drift

(0.5

µV/°C)

and

high

common-mode rejection (120dB at G

≥ 100). It

operates with power supplies as low as

±2.25V, and

quiescent current is only 700

µA—ideal for battery-

operated systems. Internal input protection can

withstand up to

±40V without damage.

The INA128/INA129 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.

A

1

A

2

A

3

40k

Ω

40k

Ω

40k

Ω

40k

Ω

V

IN

2

1

8

3

6

5

V

IN

R

G

V+

Ref

V

O

G= 1 +

49.4k

Ω

R

G

−

+

4

7

NOTE: (1) INA129: 24.7k

Ω

G= 1 +

50k

Ω

R

G

INA128, INA129

Over-Voltage

Protection

Over-Voltage

Protection

25k

Ω(1)

25k

Ω(1)

INA128:

INA129:

All trademarks are the property of their respective owners.

INA128

INA129

Precision, Low Power

INSTRUMENTATION AMPLIFIERS

SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

www.ti.com

Copyright

 1995−2005, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.