SBOS445C July  2008  – December 2015 INA333


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
    4. 7.4Device Functional Modes
      1. 7.4.1Internal Offset Correction
      2. 7.4.2Input Common-Mode Range
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. Setting the Gain
        2. Internal Offset Correction
        3. Offset Trimming
        4. Noise Performance
        5. Input Bias Current Return Path
        6. Input Common-Mode Range
        7. Operating Voltage
        8. Low Voltage Operation
        9. Single-Supply Operation
        10. Protection
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Development Support
        1. (Free Download Software)
    2. 11.2Documentation Support
      1. 11.2.1Related Documentation
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information

11 Device and Documentation Support

11.1 Device Support

11.1.1 Development Support TINA-TI (Free Download Software)

Using TINA-TI SPICE-Based Analog Simulation Program with the INA333

TINA is a simple, powerful, and easy-to-use circuit simulation program based on a SPICE engine. TINA-TI is a free, fully functional version of the TINA software, preloaded with a library of macromodels in addition to a range of both passive and active models. It provides all the conventional DC, transient, and frequency domain analysis of SPICE as well as additional design capabilities.

Available as a free download from the Analog eLab Design Center, TINA-TI offers extensive post-processing capability that allows users to format results in a variety of ways.

Virtual instruments offer users the ability to select input waveforms and probe circuit nodes, voltages, and waveforms, creating a dynamic quick-start tool.

Figure 41 and Figure 42 show example TINA-TI circuits for the INA333 device that can be used to develop, modify, and assess the circuit design for specific applications. Links to download these simulation files are given below.


These files require that either the TINA software (from DesignSoft) or TINA-TI software be installed. Download the free TINA-TI software from the TINA-TI folder.

INA333 ai_lo_pwr_log_cir_bos445.gif


The following link launches the TI logarithmic amplifiers web page: Logarithmic Amplifier Products Home Page
Figure 41. Low-Power Log Function Circuit for Portable Battery-Powered Systems
(Example Glucose Meter)

To download a compressed file that contains the TINA-TI simulation file for this circuit, click the following link: Log Circuit.

INA333 ai_vga_pt100_bos445.gif


RWa, RWb, RWc, and RWd simulate wire resistance. These resistors are included to show the four-wire sense technique immunity to line mismatches. This method assumes the use of a four-wire RTD.
Figure 42. Four-Wire, 3-V Conditioner for a PT100 RTD With Programmable Gain Acquisition System

To download a compressed file that contains the TINA-TI simulation file for this circuit, click the following link: PT100 RTD.

11.2 Documentation Support

11.2.1 Related Documentation

For related documentation see the following:

  • Precision, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifiers, SBOS642
  • 50μV VOS, 0.25μV/°C, 35μA CMOS OPERATIONAL AMPLIFIERS Zerø-Drift Series, SBOS432
  • Circuit Board Layout Techniques, SLOA089

11.3 Trademarks

All trademarks are the property of their respective owners.

11.4 Electrostatic Discharge Caution


These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

11.5 Glossary

SLYZ022TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.