SLPS785 December   2023 RES11A

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Pin Configuration and Functions
  6. Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. Parameter Measurement Information
    1. 6.1 DC Measurement Configurations
    2. 6.2 AC Measurement Configurations
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Ratiometric Matching
      2. 7.3.2 Ratiometric Drift
      3. 7.3.3 Predictable Voltage Coefficient
      4. 7.3.4 Ultra-Low Noise
    4. 7.4 Device Functional Modes
  9. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Discrete Difference Amplifier
        1. 8.1.1.1 Difference-Amplifier Common-Mode Rejection Analysis
      2. 8.1.2 Discrete Instrumentation Amplifiers
        1. 8.1.2.1 Instrumentation Amplifier Common-Mode Rejection Analysis
      3. 8.1.3 Fully Differential Amplifier
    2. 8.2 Typical Application
      1. 8.2.1 Common-Mode Shifting Input Stage
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Examples
  10. Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™ Simulation Software (Free Download)
        3. 9.1.1.3 TI Reference Designs
        4. 9.1.1.4 Filter Design Tool
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information
    2. 11.2 Mechanical Data

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DDF|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Instrumentation Amplifier Common-Mode Rejection Analysis

The differential-input, differential-output instrumentation amplifier shown in Figure 8-3 has a common-mode gain of ACM = 1 V/V. The differential gain is described by the following (assuming an ideal amplifier):

Equation 24. A D = R G1 + R G2 R IN1 + R IN2 + 1 = G nom × t RG1 + t RG2 t RIN1 + t RIN2 + 1

Because the worst-case-stage CMRR occurs when the differential gain is lowest, and the common-mode gain is unity, the minimum CMRR is evaluated as:

Equation 25. A D A CM = G nom × 1– t RG1 + 1– t RG2 1+ t RIN1 + 1+ t RIN2 + 1 = G nom × 1.9995 2.0005 + 1

For example, for an instrumentation amplifier with RES11A90, the worst-case CMRR is:

Equation 26. A D A CM = G nom × 1– t RG1 + 1– t RG2 1+ t RIN1 + 1+ t RIN2 + 1 = 9 V/V × 1.9995 2.0005 + 1 = 9.9955 V/V