SBOS027C September   2000  – September 2022 INA118

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
      1. 8.4.1 Noise Performance
      2. 8.4.2 Input Common-Mode Range
      3. 8.4.3 Input Protection
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Setting the Gain
        2. 9.2.2.2 Dynamic Performance
        3. 9.2.2.3 Offset Trimming
        4. 9.2.2.4 Input Bias Current Return Path
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Low-Voltage Operation
      2. 9.3.2 Single-Supply Operation
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

9.3.2 Single-Supply Operation

The INA118 can be used on single power supplies of 4.5 V to 36 V. Figure 9-10 shows a basic single-supply circuit. The output Ref pin is connected to ground. Zero differential input voltage demands an output voltage of 0 V (ground). The actual output voltage swing is limited to approximately 35-mV above ground, when the load is referred to ground as shown. Figure 7-15 shows how the output voltage swing varies with output current.

With single supply operation, V+IN and V–IN must be 1.2-V greater than ground for linear operation. Connecting the inverting input to ground and measuring a voltage connected to the noninverting input is not possible.

To illustrate the issues affecting low-voltage operation, consider the circuit in Figure 9-10, which shows the INA118 operating from a single 5-V supply. Depending on the desired gain, a resistor in series with the high side of the bridge can be required to make sure that the bridge output voltage is within the common-mode range of the amplifier inputs. See Figure 7-5 for 5-V single supply operation.

Figure 9-10 Single-Supply Bridge Amplifier