1 Features

1• Low Offset Voltage: 25 uV Typical

• Low Input Bias Current: 50 nA Typical (1)

• High CMR: 95 dB Typical(1)

• Inputs Protected to ±40 V

• Wide Supply Range: ±2.25 V to ±18 V

• Low Quiescent Current: 2 mA Typical(1)

2 Applications

• Bridge Amplifiers

• Thermocouple Amplifiers

• RTD Sensor Amplifiers

• Medical Instrumentation

• Data Acquisition

• Supports Extreme Temperature Applications:

– Controlled Baseline

– One Assembly/Test Site

– One Fabrication Site

– Available in Extreme Temperature Ranges

(–55°C to 210°C) (2)

– Extended Product Life Cycle

– Extended Product-Change Notification

– Product Traceability

3 Description

The INA128-HT and INA129-HT are low-power,

general-purpose instrumentation amplifiers offering excellent accuracy. The versatile three-operational-

amplifier design and small size make them ideal for a

wide range of applications. Current-feedback input

circuitry provides wide bandwidth even at high gain. A single external resistor sets any gain from 1 to 10000.

The INA128-HT provides an industry-standard gain

equation; the INA129-HT gain equation is compatible

with the AD620.

The INA128-HT and INA129-HT are laser trimmed for

very low offset voltage (25 μV Typ) and high

common-mode rejection (93 dB at G ≥ 100). These devices operate with power supplies as low as ±2.25

V, and quiescent current of 2 mA, typically. Internal

input protection can withstand up to ±40 V without

damage.

Texas Instruments' high-temperature products use

highly optimized silicon (die) solutions with design

and process enhancements to maximize performance

over extended temperatures.

The INA129-HT is available in 8-pin ceramic DIP and

8-pin ceramic surface-mount packages, specified for

the –55°C to 210°C temperature range. The INA128-

HT is available in an 8-pin SOIC-8 surface-mount

package, specified for the –55°C to 175°C temperature range.