SBOS501F January 2010  – February 2015 INA128-HT , INA129-HT

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information: INA128-HT
    5. 7.5Electrical Characteristics: INA128-HT
    6. 7.6Electrical Characteristics: INA129-HT
    7. 7.7Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
    4. 8.4Device Functional Modes
      1. 8.4.1Noise Performance
      2. 8.4.2Input Common-Mode Range
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Setting the Gain
        2. 9.2.2.2Dynamic Performance
        3. 9.2.2.3Offset Trimming
        4. 9.2.2.4Input Bias Current Return Path
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
    1. 10.1Low Voltage Operation
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
    2. 12.2Related Links
    3. 12.3Trademarks
    4. 12.4Electrostatic Discharge Caution
    5. 12.5Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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)
(1) Typical values for 210°C application.

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
(1) Custom temperature ranges available.

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.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
INA128-HTSOIC (8) 4.90 mm × 3.91 mm
INA129-HTCFP (8)6.90 mm × 5.65 mm
CDIP SB (8)11.81 mm × 7.49 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

INA128-HT INA129-HT fbd1_bos501.gif