1 Features

• Low offset voltage: 50 μV, maximum

• Low drift: 0.5 μV/°C, maximum

• Low input bias current: 5 nA, maximum

• Low noise: 8 nV/√Hz, 0.2 μVpp

• High CMR: 120 dB, minimum

• Bandwidth: 1.3 MHz (G = 1)

• Inputs protected to ±40 V

• Wide supply range: ±2.25 V to ±18 V

• Low quiescent current: 700 μA

• Packages: 8-pin plastic DIP, SO-8

2 Applications

• Pressure transmitter

• Temperature transmitter

• Weigh scale

• Electrocardiogram (ECG)

• Analog input module

• Data acquisition (DAQ)

3 Description

The INA128 and INA129 (INA12x) are low-power,

general-purpose instrumentation amplifiers that offer

excellent accuracy. The versatile three op amp design

and small size make these amplifiers an excellent

choice for a wide range of applications. Currentfeedback

input circuitry provides wide bandwidth even

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

A single external resistor sets any gain from 1 to

10,000. The INA128 provides an industry-standard

gain equation with a 50-kΩ resistor. The INA129 gain

equation uses a 49.4-kΩ resistor to allow for drop-in

replacements of comparable devices.

The INA12x are available in plastic DIP and surfacemount

packages, specified for the –40°C to +85°C

temperature range. The INA128 is also available in a

dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias

current (0.6 nA, max) and lower noise (7 nV/√Hz)

at the same quiescent current. See the Device

Comparison Table for a selection of precision

instrumentation amplifiers from Texas Instruments.