1 Features

• 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) ⁽¹⁾
  • 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic