SBOSAA0C november   2021  – may 2023 INA350

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Gain-Setting
        1. 8.3.1.1 Gain Error and Drift
      2. 8.3.2 Input Common-Mode Voltage Range
      3. 8.3.3 EMI Rejection
      4. 8.3.4 Typical Specifications and Distributions
      5. 8.3.5 Electrical Overstress
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Reference Pin
      2. 9.1.2 Input Bias Current Return Path
    2. 9.2 Typical Applications
      1. 9.2.1 Resistive-Bridge Pressure Sensor
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 PSpice® for TI
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.1 Overview

INA350 is a selectable gain instrumentation amplifier mainly targeted to provide an integrated small size, cost effective solution for applications employing general purpose INAs or discrete implementation of INAs using commodity amplifiers and resistors. It incorporates a three op amp INA architecture integrating three operational amplifiers and seven precision matched integrated resistors. It is mainly targeted for use in 10-bit to 14-bit systems, but calibrating offset and gain error at a system level can further improve system resolution and accuracy enabling use in precision applications.

One of the key features of INA350 is that it does not need any external resistors to set the gain. Often these external resistors warrant tighter tolerance and need to be routed carefully which adds to the system complexity and cost. INA350 is offered in four gain options across two variants. INA350ABS has two gain options of 10 and 20. INA350CDS has two other gain options of 30 and 50. Gains can be selected by connecting the GS pin to logic high or logic low. Note that the GS pin can be left floating as well, as it is designed with an internal pull up to default to the same configuration as GS tied logic high.

The INA350 is developed for industrial applications in factory automation and appliances sector where pressure sensing and temperature sensing are done using bridge-type sensor networks and load cells. It can also be used in tight spaces in medical applications such as patient monitoring, sleep diagnostics, electronic hospital beds, blood glucose monitoring, and so forth for voltage sensing and differential to single-ended conversion. INA350 can enable these applications to reduce their overall size through the use of tiny packages, including a 2-mm × 1.5-mm X2QFN package and a 2-mm × 2-mm WSON package.