SBOS069A October   1997  – December 2024 INA122

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Setting the Gain
      2. 6.3.2 Input Common-Mode Range
      3. 6.3.3 Input Protection
      4. 6.3.4 Output Current Range
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Offset Trimming
      2. 7.1.2 Input Bias Current Return Path
    2. 7.2 Typical Application
      1. 7.2.1 Resistive-Bridge Pressure Sensor
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 PSpice® for TI
        2. 8.1.1.2 TINA-TI (Free Software Download)
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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発注情報

6.3.1 Setting the Gain

Figure 6-2 shows the basic connections required for operation of the INA122. The output is referred to the output reference (Ref) pin that is normally grounded.

Use Equation 1 to calculate the gain of the INA122. Set the gain by connecting a single external resistor, RG, to the INA122 as shown in Figure 6-2.

Equation 1. G   =   5   +   200 k Ω R G

Table 6-1 shows the commonly used gains and RG resistor values.

The 200kΩ term in Equation 1 comes from the internal metal film resistors which are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA122.

The stability and temperature drift of RG also affects gain. The contribution to gain accuracy and drift from RG can be directly inferred from Equation 1.

INA122 INA122 Basic ConnectionsFigure 6-2 INA122 Basic Connections
Table 6-1 Commonly Used Gains and Resistor Values
DESIRED GAIN (V/V) RG (Ω) NEAREST 1% RG VALUE (Ω)
5 NC(1) NC(1)
10 40k 40.2k
20 13.33k 13.3k
50 4.444 4.42k
100 2105 2.1k
200 1026 1.02k
500 404 402
1000 201 200
2000 100.3 100
5000 40 40.2
10000 20 20
(1) NC: No connection