INA128U/2K5 Audio Power Amplifier IC Instrumentation Amplifiers Precision Low Power Instrumentation Amp

1 Features

• A newer version of this device is now available: INA828

• Low offset voltage: 50 μV maximum

• Low drift: 0.5 μV/°C maximum

• Low Input Bias Current: 5 nA maximum

• High CMR: 120 dB minimum

• 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

• Bridge amplifier

• Thermocouple amplifier

• RTD sensor amplifier

• Medical instrumentation

• Data acquisition

3 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 these amplifiers ideal for a wide range of applications. Current-feedback 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; the INA129 gain equation is compatible with the AD620.

The INA12x 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.

The upgraded INA828 offers a lower input bias current (0.6 nA maximum) 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.

Device Information