SBOS508A December   2009  – December 2015 INA129-EP

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Noise Performance
      2. 7.4.2 Input Common-Mode Range
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Setting the Gain
        2. 8.2.2.2 Dynamic Performance
        3. 8.2.2.3 Offset Trimming
        4. 8.2.2.4 Input Bias Current Return Path
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Low Voltage Operation
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

The minimum power supply voltage for INA129-EP is ±2.25 V and the maximum power supply voltage is ±18 V. This minimum and maximum range covers a wide range of power supplies; but for optimum performance, ±15 V is recommended. TI recommends adding a bypass capacitor at the input to compensate for the layout and power supply source impedance.

9.1 Low Voltage Operation

The INA129-EP can be operated on power supplies as low as ±2.25 V. Performance remains excellent with power supplies ranging from ±2.25 V to ±18 V. Most parameters vary only slightly throughout this supply voltage range.

Operation at very low supply voltage requires careful attention to assure that the input voltages remain within their linear range. Voltage swing requirements of internal nodes limit the input common-mode range with low power supply voltage. Figure 5 and Figure 6 show the range of linear operation for ±15 V, ±5 V, and ±2.5 V supplies.

INA129-EP bridgeamp_bos501.gif Figure 23. Bridge Amplifier
INA129-EP thermoamp_bos501.gif Figure 25. Thermocouple Amplifier With RTD Cold-Junction Compensation
INA129-EP ecgamp_bos501.gif Figure 27. ECG Amplifier With Right-Leg Drive
INA129-EP acamp_bos501.gif Figure 24. AC-Coupled Instrumentation Amplifier
INA129-EP diffv_converter_bos501.gif Figure 26. Differential Voltage to Current Converter